<human>: Cheating isn't acceptable. I've been cheated on, and I know exactly how it feels, which makes the situation I'm in much, much worse. I have a friend who I've known for about a year now, and I've always had a crush on her. She's just the kind of person who people like immediately. 

About a month ago, her and I were hanging out, just the two of us and things got flirty. We ended up kissing and fooling around a little bit, and both knew no one could find out. This escalated and we started sleeping together. We talked about it, how it was just no strings, our little secret and that it's not hurting anyone as long as they don't find out. I knew immediately that what we were doing was wrong, and it doesn't help that her boyfriend is a legitimately good guy who treats her right. I can't say that I'm good friends with him, but I've met him a handful of times and he's always friendly, polite and likable by everyone. 

I want to put a stop to our thing because I know that it's wrong and no one deserves to be cheated on and lied to, especially this guy. The problem is, I'm developing feelings for this girl passed our friendship. At first, it was just hooking up, nothing serious, I've had friends with benefits situations before and never let feelings get in the way. With this girl though, I've known her and had these feelings brewing for so long, that I can't just put a stop to it and let it go. 

I know I could never be in an actual relationship with her, especially after this and knowing she's able/willing to cheat on a guy she's been with for several years. I guess what I'm really looking for is suggestions on how I can distance myself and work my way out of this situation from those who have been in any kind of similar situation. 

I've done something extremely shitty, and I'm well aware. I feel terrible, and I don't want these feelings to consume and guide me into doing any worse if I can help it.

Can you condense the text into a few key points?
<bot>: I'm sleeping with a friend who has a boyfriend and now I'm starting to like her romantically, Fuck.