friends and the ex

I went out with someone for a year, and broke up with him just before Christmas. He had a short temper and gave me a month of hell before I snapped back, and we continued to argue for two months after that - so a REALLY awful break up. I gave him leeway initially because he was upset, but it went on too long, and he said some really nasty things.

Anyway, he had a group of friends before we were together, and once we were an item I would go to parties with them etc. and we all became good friends. In the break-up, I said I would back off from them, because it was my choice to leave my ex.

However, his initial month of brutal hatred led to me turning to these friends for extra support, especially since I have anxiety problems and was having panic attacks at this point. My ex flipped out about this, and rejected the friends for a brief period. He said I had stolen them from him.

Time went on, and ultimately we switched back. I don't talk to my ex, and he is part of that friendship group again.

The controversy is... the friends have INTENTIONALLY planned a party to clash with his birthday party, and invited me instead :/ I feel awful. Do I go? Do I talk to my ex and apologise? They seem annoyed with him on my behalf

He seems really nasty, so no. Forget him and move on. It's not your problem if your friends are annoyed with him. Also, what's the issue with going to a party with your friends? No need to apologise for that.

Cut him out completely. He's not worth it.