I like a girl and I've known her forever but she has a boyfriend so I don't want to want to tell her how I feel. We don't hang out much but we are still good friends and she's the only one I can think of. I'm friends with her friends and we all get along but she doesn't know how I feel but as I said I don't want to say anything. What can I do? Any advice?

Keep quiet about your feelings until such time as this girl breaks off her relationship.

If she doesn't then sorry it would seemed you've missed out.

You can't help your feelings,but you can help how you deal with them.

She has a boyfriend and she is off limits.

Turn the tables around,if you were with her and a another man confessed his feelings and continued hanging around,how would you feel?

Jealous,insecure?

She knows who you are and where you are,if she wanted achance to be with you,she would be single,but she 's not.

You need to find away to deal with your feelings and/or avoid her.

You can leave her alone. She has a boyfriend.
This is like asking how you can break into some one's house because you saw something in there you like.