I'm a pushover hussy how do I stop my patterns?

So maybe I had a little feeling that yeah, you're full on in a relationship. But that has never gotten in the way of us hanging before, b/c yeah, I thought we really were just friends, and I even valued your friendship. So when you invited me over to “HANG”, we hung, we watched a movie and it got late. real late. moves were made and next thing ya know humping was happening. At approx 4am, an hour widely inappropriate for me to return to the place I was visiting, you told me, while we were still naked and intertwined on the couch, that sure, I could crash, but we had to “reside in separate rooms”. Wha??! Shady. SHady shady shady. and ya know, this was probably because you didn't want the hussy you were cheating on your girlfriend with sleeping in the bed you share with said girlfriend. ME, the post **** pushover hussy trapped in your manipulative charms, accepted the couch and your explanation of “its hard to explain, I just have personal boundaries”. PERSONAL BOUNDARIES? Your balls were just in my face, but now you have PERSONAL BOUNDARIES?? I'm angry at myself that let you think I was a-ok with this arrangement ,instead of voicing my fury, I'm angry that I was a pushover and stayed because I felt like I had no place else to go, when in fact I should have just hung out at the nearest convenience store with the rest of the hookers. I'm angry because I know Im not the only ho you've played behind your girlfriend's back, and I'm angry because you have the whole world believing that you are just the coolest nicest dude in the city, an image you have expertly crafted and totally get off on, you dirty, manipulative hustler. I'm angry that I knew better but I did it anyways, and I'm angry that almost a year later, it still bothers me. I'm angry because I tricked myself into thinking “I let it go”, but in the face of an (unrelated) personal crisis when I was forced to “dig deep” within myself to find some strength, I run in to you and the hurt this caused me, buried deep and festering. I'm angry that our friendship is ruined, and that I didn't even consider that it may have been a farce on your part all along just to eventually get it in. I'm frustrated because I don't know how to deal with this, should I be the crazy ***** who brings up a year-old one night stand and tell you really and completely how hurt I am? But you know, even if I did make up my mind to talk to you, I probably couldn't, because your crafty smooth charms would manipulate the conversation and I would just be the pushover. The ironic thing about all of this is that when I first met you, 5 years ago, I thought you were an annoying dweeb. So **** me.