<human>: Can you provide a brief overview of the text?

A bit of a back-story, I have known this friend all my life, he had always been quirky and a bit different, but never really seemed to be anything more or less than a normal person. I had always known he had had feelings for my girlfriend, but I just brushed them off as a crush. Recently, me and my girlfriend had broken up, as she had moved into a college dorm and let the new life take her over, leaving me in the dust. I left her and she just said it was what she wanted anyways. 

Fast forward 3 weeks to yesterday, when my friend texts me and asks if he can hangout with my ex. The question seemed a bit off, I was suspicious as to why he would even ask, but I said I didn't care. A few hours later, I get a call from my friend's roommate. Him, my friend, and my ex had been hanging out, when all of a sudden my friend snapped. He jumped on my ex, pinned her to the ground, and tried to remove her pants. Fortunately the roommate was there and my friend is only about 110 pounds, so my ex managed to escape. The roommate said my friend acted like nothing bad happened, and he doesn't know what to do. Also, when he tried to talk to my friend about it my friend threatened to make his life hell if he told anyone. Shortly afterwards, I get a call from my ex. She gives me the exact same description as the roommate, and starts to beg for me back as she needs the support through the trauma, saying how she acted at the dorm was wrong and that she just needs someone to be with. I offered to get help but said I didn't want to be with her, and she freaked out, saying she was going to overdose on pills as she had nothing to live for, and hung up. She had been seriously addicted to pills in the past, so I tried to contact her but I couldn't get an answer, and I have no way of getting into her dorm room without her consent. I don't know whether to take legal action, call the college, call her parents, confront my friend, or just do nothing. Reddit, what should I do?
<bot>: My friend tried to rape my ex girlfriend who has now locked herself away and possibly overdosing, and I'm stuck in the middle not knowing what to do.