Physical & Emotional Abuse Support Group
Abuse is a general term for the treatment of someone that causes some kind of harm (to the abused person, to the abusers themselves, or to someone else) that is unlawful or wrongful. No one deserves abuse, period. Abuse can be emotional, physical, or sexual.
On one hand, your ex should not keep you from doing the things that you want to do, you have the freedom now to choose for yourself. Also if you have a good support system with you that might help. Your ex may not even be there.
On the other hand, I do now know the details of your abuse, so I don't know if its worth it.
I think if you went, make a plan for what to do if you see your ex, and tell your friends about it.