I think I messed up my chances with him. Emergency, please help.

louiseee
I love my ex. Flat out. And we broke up about a month and a half ago and we still hung out and everything seemed the same. We were going to get back together, he was coming to Thanksgiving with my family and everything was good. I was dating a few guys on the side and on Friday I hung out with one of the other guys. Nothing happened, I didn't even kiss him. Yesterday I was with my ex and he asked me if Friday was a date. It was out of the blue and I didn't answer and he said "So, that's a yes" and this morning he said that he didn't want to go to Thanksgiving with me and that he didn't want to date me and he decided this last night.

Please help me. I want him back so badly, what can I do or say?
Updates
+1 y
CORRECTION TO EVERYONE:

By dating other guys on the side I did not mean I was dating other guys while him and I were a couple. After we broke up, we still hung out and acted like a couple and while we were single I was also going on dates with other people
I think I messed up my chances with him. Emergency, please help.
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