I really like this girl but she has a boyfriend?

[James]

Hey, there is this girl on my college course and the moment I first saw her I liked her, never been like that with another girl so it was weird for me. Basically I've been talking to her a lot recently trying to know her a bit more. She laughs at my jokes, smiles at me, gets close to me at times, sometimes she has touched me on my arms, knee and legs. She has a boyfriend and it's really has upset me when I found out it's just my luck :/ I don't want to ruin their relationship at all because I ain't that kind of guy. I don't know what to do she's my type and we have a lot in common, I don't want to lose this girl when the course finishes but it's difficult. Please help me on what I should do

Thank you for taking the time to answer my question <3