Im trying to slip away from the person I love?

I've stopped seeing her and school and ignore her in the halls, but I still have trouble avoiding her outside of school. Were in the same dance crew and so I have to talk to her there... That is the BIGGEST problem because when she talks to me, she can change my emotion from indifference to caring... Your probably wondering why im avoiding someone I love. Well, we had a great relationship in the past, but now she has a bf and everything we had she just ripped away from me. I juist can't handle being by her because she mixs my emotions with Love and indifference. I need to get out of this. Any suggestions please?