Resigning soon, are there any legal consequences I could possibly face regarding how I will resign?

Ok I don't want to get into specific details but basically had a physical harrassment issue going on with one of the manager's of my team. At first, I thought the guy was being funny/joking around but two incidents lead to crossing physical boundaries and resulting in physical pain. At that point, I had no choice but to confront the guy which I did in private in one of the office rooms and basically the guy denied every single issue and chose the "I have no idea what you are talking about and never layed a hand on you" route. I had no proof at the time, but could have got the footage had I thought about it at the time but it is way past that point to even get the footage but had I gotten it right after the confrontation, would have caught this guy in a flat out lie. At the time, I had no idea the guy would deny as the incidents were very signficant in their nature and something you could not forget but I underestimated the guy and never thought he would actually lie about this.

During the heated confrontation, my supervisor had to get involved and finally eased tensions and separated us as I continued to accuse him of the incidents and he continued to deny. The next day, my supervisor tells me he spoke to the other manager and consoles me that he won't bother me again and that he possibly could move to another department or move so that I would never have to be involved with him again which never happened. Also I never reported to HR about this incident or issue fearing that it would probably lead to my termination. I'm surprised I was never terminated as well just by confronting the guy aggressively(my voice got loud, never touched the guy whatsoever but I started yelling at him due to physical pain he caused as well as refusing to own up to his actions) but I later came to find out my supervisor did speak to HR and reported this incident although I'm not sure what was said but I'm assuming probably was reported in a way that cast a bad light of me regarding how the tense confrontation between me and this manager went down but HR never came to me about this issue. I wouldn't be surprised if the entire situation was reported and altered in a way to protect the manager and my supervisor.

It's been a year since that intense confrontation and the manager is still working in the same team and I still have to interact with him from time to time although in cordial and respectable manner but I still I find it very discomforting knowing this guy lied to me as well as I continue to be reminded about how the guy treated me as well as the confrontation itself but he has treated me overly nice probably since I called him out on his behavior but I still do not feel comfortable around the guy at all. I dont know what else I can do and so I have thought about resigning instead to save myself from more potential problems and distancing myself from this guy as completely as possible.

I have received a new job offer and have accepted it and I told them I will give my company 2 weeks notice but I don't. I'm just going to resign sometime within this 2 week period, however it was never my intention to leave this job because besides this issue, everything else about my job has been wonderful but this was enough and unforgiveable for me to stay and the only way I would stay is if this guy goes but I know it is unlikely this will happen but this guy although switched up his behavior he still causes a ton of discomfort and decided its best I removed myself from this situation completely.

I plan to go to HR and notify them that I resign on that day. However, I plan to let my HR know exactly my reasoning verbally and that I can no longer be around this liar and coward. I plan to explain the specific details of all the incidents as well as what went down right before the confrontation as well as the confrontation itself. I plan on being completely honest to the HR guy aand just let them know what I experienced and why I don't want to work there anymore but also thanking them for giving me an opportunity as well. I remember details really well as I had written about these incidents as they happened so I have dates of the incidents as well as description. I also plan to leave a short concise written resignation letter summarizing this whole ordeal without too much details but basically will name the manager in it basically saying I can no longer work around a coward and a liar and firmly believe this guy was lying and that this is the reason I chose to leave although and I also plan to email this same letter to HR, my team leader, and supervisor so it is documented electronically as well to go along with the copies of the letter they will receive.

Right after speaking to HR and leaving them a copy of the letter, I plan to speak to the team leader who I have no idea knows about this incident but I plan to explain to him exactly what went down as well because I don't trust my supervisor completely to explain to him why I resign as the supervisor seems to be somewhat friends with the manager. I then plan to go to my supervisor and he already knows this issue I have with the manager clearly well and will tel him I resign as well and there's no need for me to explain the details since I already told him before. Then once all is said and done, send the email of the resignation letter to them so my resignation is documented electronically as well.

Now my question really is, is there a possibility I could face legal consequences for this? Could I possibly be sued for defamation or sued in anytype of way if the guy finds out I told everything about what went down to HR, the team leader that we all work under? I know the guy clearly has no problem lying so I won't be surprised if he continues to lie about some more stuff but I'm just worried if he has a case for anything because I don't want to leave without telling my reasons and feel HR should at least know as well as my team leader( although with the team leader, I think I will most likely just thank him for the opportunity and tell him if he wants to know my exact reasoning for leaving that he can go to HR for the explanation, is this a better idea?) but if my steps to resign can lead to actual legal consequences, then I'd rather just resign and tell them I found better opportunities and only tell my supervisor the real reason I have left.

Could you give me advice on what you think of all of this. Am I taking a wrong approach? Like I said before, it's been a year since and I never had the evidence to back up my claims but looking back I actually could have but the thought of it never came up until just recently when it had to occurred to me that some of the incidents did have cameras around so when I sought out to go back to one of the incidents that occurred where he clearly put his hands on me in an inappropriate manner but the establishment informed me that the footage I was requesting was already way past the time their cameras saved the footage.