Yes, sometimes we say and do hurtful things through a breakup. But your insistence on receiving back a gift you had given him was wrong to do, I have to be honest with you. You should never ask for a gift back. It's a gift, and even through a breakup, we don't ask for them back. Hopefully you can forgive yourself for your hurtful words, and hopefully you will have a chance to apologize, but I would not contact him again. Unfortunately, that bridge is burned and his ship has sailed away. I hope for your own sake you don't run into him at the concert.