First of all, I would never ask these kinds of questions under normal circumstances since I believe firmly that most issues can be solved with inner game and an analytical mind. However, the logic involved here baffles me. Here is the situation, I am currently spinning 3 plates as a freshman in college. All is going well, except for one of the girls, who unfortunately is the one that I am interested in having a real relationship with. I know seddit doesn't usually recommend to go into relationships etc, but at the risk of sounding cliche, we have great chemistry, sex is great, conversation is amazing, finally a girl who shares an interest in both reddit, gaming and star trek. ( yes I'm a huge nerd, but I'm pretty sure a few of us here are ) Issue ? She's also interested in another guy, but hasn't done anything with him at all, apart from spending a lot of time with him. She still comes to bed with me at night, but she definitively has an interest in sleeping/dating him. The twist is, that she really wants to be with me, cried when I tried to end it with her, and says that she doesn't understand herself, in that she would jeopardize a great relationship just on the off-chance of getting on with that guy, even though she knows it's amazing being with me. (she's not lying, I know her inside out ). I guess this is to a certain extent a case of one-itis, but I'm mostly curious in the psychology involved in this situation. Why would a girl jeopardize something good on the off-chance of getting on with another guy ? My first guess would be that it's the mystery, the unknown that intrigues her, and till she doesn't try it, she won't be able to decide between me and her. Moreover, it's not a case of her liking him more than me, since she says it would be the same if the roles were reversed. My first instinct to solve this issue would be to make an ultimatum, telling her that I won't be there for her forever. I have tried the jealousy approach, which is gaming other HBs in front of her, which worked great, but is an unreliable method. Help seddit ? Finally, unrelated but a major tip : *dress well, follow Male Fashion Advice ( although it can be some pretty horrible advice sometimes ) Since I've started to dress well, girls have been opening me more than I have opened them ( peacocking I guess ? ), and I have a reputation of having the greatest collection of scarves on campus. And no this does not belong in r/relationshipadvice , since I'm not stuck on this girl, but would like to make it work.