I joined a society and a guy there used to help me as I was new and had no idea what to do. We never really spoke much and then he started trying to get to know me a little and we'd flirt a little. On a social he got a little too friendly and we nearly kissed. When I saw him after that he was distant and it seemed like he was avoiding me. I have later since found he has a girlfriend who he's been with for around 3 years that I never knew about. I obviously do like him but wouldn't act upon my feelings because of the girlfriend. He says he remembers nothing from that night because he was drunk but I have a feeling he's not being honest about it. What should I do?
... and the ones that won't