SUBREDDIT: r/relationships
TITLE: My girlfriend was sexually assaulted right before I was going to real up with her. [18 and 18]
POST: Im an 18 year old male currently in a long term relationship. I go to school at uchicago, and my 18 year old girlfriend is at u of I. Our relationship was very unhealthy and we had trust issues, but we foolishly decided to continue. She has been in school since August, but I just started last week. Every Time we talk it seems like a fight starts, and we dont talk very often. When I started college, I realize that I liked girls here and started forming connections, although I wouldn't cheat or anything. I finally decide to break up with her, and I called her today. She answered the phone crying, and said that a guy had taken advantage of her after a party, before I mentioned breaking up. I comforted her and heard the story, and did not break up with her. She said she didn't want to report it, which upsets me. I still don't want to continue the relationship, but I fell like I can't end it because she is so volnurable right now. What the heck am I to do? She visits in a week, and that will sorta set our relationship in stone to all of the girls that I know, and ruin the dynamic with them.
TL;DR: 
I really want to break up with my girlfriend, preferably by next week, but she is a victim of sexuall assault and I feel the need to support her.