OCD Hitting Below the Belt

I have an unusual case... or not.
When I'm alone I suffer from Nice Guy Syndrome: Pretty much a frustration with how things ended with my last crush results in really intense feelings of resentment and even a little rage. Part of it is because my OCD... I guess 'replays' scenarios where she and someone else goad me into fighting by pouring salt into my wounds with their words, and I only get angrier. Thing is, it's my visions doing that, not them. Yes, the OCD is based on their attitude when I last saw them but still.

Just so that you know... these feelings disappear when I'm with a friend or an actual woman. No rage, no anything and it feels natural. I'm not hiding that part of myself it just disappears. And besides, I know well enough that my emotions aren't a good excuse to take things out on others. I've never made anyone suffer for my pain, even though sometimes I feel like I'm in pain alone because of it.

Any advice on how to handle OCD that preys on the most vulnerable part of you?

Bonus Info: It's funny how the women who have taken advantage of me was never enough for me to get OCD, but the one person I was trying to fall out of love with being a massive, unsympathetic hypocrite is (those parts of her weren't obvious to either of us when I first befriended her. It's still probably not obvious to her).
FTR I have been used for money and... that was it. I forgot about that woman in a month. This OCD is going on over a year now.

Also before I knew I had OCD I talked about having 'violent, angry thoughts' and some people just said 'you have an anger problem' in a kind of judgmental way. It was the 'bad thoughts' that played a part in some hypocrisy. I was judged as being a worse person for having obsessive thoughts but never acting on them than the guy with less impulse control but he 'I didn't know what he went through.' I think I'm partially still resentful because I believed that for a while.

That's the problem warts and all... except it's really in a nutshell because I don't have the time (or desire) to relive every detail and I want to ultimately stay focused on just keeping the intensity of the feelings down when I'm alone.

Do you find your mind plays out scenarios, and you actually react to them, emotionally? For example, you overhear people talking, play out a scenario in which they are all saying horrible things about you, so you get pissed off and perhaps end up a little "snippy" with them, when you talk to them. Another one might be a scenario in which you feel saddened, or various other emotions.

I react to them emotionally on the inside, like anger, but I don't let it show in public where I manage to keep them in check.

Thing is I need no triggers: This pretty much just happens almost constantly because of how severe my emotional damage was.

Also I just had a shouting match with my OCD in the kitchen. Nobody heard me cause I was alone but the thoughts just got really intense. It doesn't help that the threat of poverty and my brother's death really amped up the pressure.