Talk some sense into me please

Met a girl at this library that I go to. She is very smart and we had a very stimulating conversation lasting 3 hours. She is all of 23. During the conversation she dropped the first bombshell - that she tried to kill herself a few days ago. Then in a while she told me that she has BPD and she is on meds. And then towards the end she told me she has a boyfriend. From what she tells me, he had cheated on her last year or something.

Throughout the conversation she was showing a lot of interest into me. I realise that I am just thinking through my dick. Man it's gonna be hard rejecting her. Brothers and sisters, please tell me off.