<human>: My girlfriend and I have been going out for three months and the relationship is very healthy. She lives in the dorms at college with a singular roommate. The roommate, A as she will be called here, has a history of mental illness which led me to deduce her self-harming practices. I waited to see if A would come clean to me about it before I said anything, which she didn't, so I told her I knew. A cried for over an hour and told me where thing were hidden (I obviously removed them and she will never be able to use those again). After, she promised she would talk to a counselor about the self harm, which I accompanied her to the appointment. She talked it out and everything was somewhat better.

Shift to post-Thanksgiving break, her temperament is completely different (which I attribute to the anti-depressants she is on). Some behaviors that lead me to thinking she likes me: she only is herself when we are alone together (girlfriend is not in the room), she only smiles when we are around each other (from what I've gathered through my girlfriend), she stares into my eyes in a way that seems more than as a friend, she half-ignores my girlfriend when she is around, she ignores both my girlfriend and I when we are together (even pretending to sleep or put headphones on and peruse Netflix). A also sat next to me, rested her head on my shoulder and looked up at me as if she was going to try to kiss me. There are probably other things that I am leaving out as a way to make sure identities are not in any way discovered, but these are the main points.

Also, I have a history of finding out about people's self-harm and trying to help and I can't look past it or ignore A and feel okay about myself. Sidenote: I do not like A, I love my girlfriend and would never cheat on her (which my girlfriend knows about both), but I am at a loss as to what I should do.

Condense the text into a few key points
<bot>: I am fairly certain my girlfriend's roommate likes me after confronting her about her self-harming ways. I can't just stop caring about a person and ignore them. What do?