TIFU By staying the night at a girl room

In September 2016, I made friends with a group of people in college that I met through a club. I'll call them A a girl, A's best friend B another girl, and A's boyfriend X. It was the weekend, and we decided to pull an all-nighter with a few other people who, throughout the night ended up leaving, so they are unimportant to the story. I think about 6 or 7 of us were together. We wandered around campus, got high, and did all the things you'd expect dumb college kids to do when there were no parties going on.

At one point, we tried going to my room to hang out, and we heard moans and decided against it, so we went to A's room instead. When we were in there, there was banging on her door, calling for X. It was the other girl he was sleeping with (they were not in an open relationship). At some point, she convinced him to leave and talk to her privately. After an hour, we tried to find them. B went to the other girl's room since she could get into her dorm, as she lived in the same building, and A and I went to X's room. We found them in his room, but X's roommate was not letting us in. She ran away crying, and we started talking in the staircase until we kissed – just kissed not full-on making out or anything like that.

I ended up walking back to her room with her, and we found B waiting outside for us, and we filled her in. A had a single room, and B and I decided that we shouldn't leave her alone. A told me it was okay to share the bed with her, and B was more comfortable sleeping under the bed (I still have no clue why but didn't question it). This is the part where I messed up. When I was cuddling her with her back to me and my right arm under her head, my left hand went over and grabbed her boob. Not that I was trying to do anything, but because I liked the way they felt. She then started to freak out and told me to get off of her, which I immediately did, as I was half-asleep and hadn't slept in over 24 hours. I apologized and rolled over. I probably should have left, but again I was overtired and told her I would stay the night.

The next morning, I was the first one to get up, and remembering last night and being hungry as hell, I figured I would let her sleep and get some food. I shot A a text saying just that, and if she didn't get up before I left, I would get her some food too. Well, I got food, looked at my phone, and got a threatening text from X. He basically told me if he ever sees me again, he's going to beat my ass. I'm a big guy, and it's not the first time someone has tried that on me, so I told him if she chooses me over him, it's his fault, and he has to live with it. Then, B and the others we were with sent me a text saying the same thing. I was confused as hell so I tried getting answers from someone, but I got nothing more from anyone, and they must have been hiding because I didn't see them around campus either. And I had no clue until the cops knocked on my door that night. They brought me to the station and questioned me. Apparently, she told everyone I full-on raped her.

I was in there for about 3 hours going through the whole night with them; again, it was an all-nighter, we started at 4-5 in the afternoon, and we went to sleep at 7-8 in the morning, so there was a lot. The next few days were hard. I ended up quitting the club that I had a passion for, got shunned by a lot of people, and had thoughts of killing myself, even attempting it.

To this day, I still have thoughts that I'm the bad guy no matter who I talk to. I have intimacy problems from this as well. This is something I think of way to much and when I have racing thoughts this is what usually comes to my mind and how everyone was looking at me when I entered a room.

TL;DR guy was cheating on his girlfriend I spent the night with her and she told people I raped her.