Learn how you can deal with liking a girl, even though she has a boyfriend. That can be a tough situation, but you need to remember that you don't own her, the boyfriend doesn't own her, she doesn't own you, and she doesn't own him. You have to remember that as a human being, you have the right to spend time with whomever you choose, and she has that right as well. You should make sure that you are reading her cues properly so that you don't get caught into some weird love triangle. Make sure that you're not stuck in the friend zone and you're just a shoulder to cry on. Make sure that you follow your heart.