trying to let go

I have really been fixating on stuff that really doesn't matter. Basically, there was a lot of stupid drama five months ago. And some things got resolved, but I don't feel like I got any closure. There are some things that I wish I would have said. But now it's too late. I've learned some new things lately about what was going on and it's just hard for me to stop thinking about it. (I'm being super vague for reasons. Also, because the details don't really matter.)
I know that it's not healthy for me to fixate on all of this. It doesn't matter. And in just a few short months it certainly won't matter at all. I just feel like I'm being treated as if it is wrong for me to be friends with the people I'm friends with. And that I'm being blamed for things I didn't actually say or do. But because I care so much about the feelings of others, I've felt so guilty for these past five months. I've felt like the bad guy. And I'm really not. It's making me really angry that after all this time, I'm still being treated as the bad guy, even though I apologized months ago for the minuscule things that I did. But I never got an apology for how I was treated. And I'm never going to get an apology. So why am I still thinking about this? Nothing good is coming from it. It's just stressing me out. I just hate that I'm letting her have this much power over me.
I am trying, really trying, to let it all go. It doesn't matter. I have friends, I am fine. One time I heard someone say that saying "I'll try" is basically the same as saying no. I don't remember where I heard this but for whatever reason it's really stuck with me. I feel like earlier (four months ago) when I said that I was trying to let it go, it really was a no. But now I'm turning it into a yes. I'm done trying. I'm letting go. I hope.