Guy here, he should be trying to earn your trust on the daily for all the things he has put you through. You deserve much better than this, I hope you realize it. He sounds like he’s never content and you’ll be paying for it as long as you indulge him. You need to break up and stay broken up because as far as he’s concerned you are always waiting for him. He needs consequences for his actions.
You act cordial and say hi and chit chat and then enjoy the rest of the party.
Guy here, he should be trying to earn your trust on the daily for all the things he has put you through. You deserve much better than this, I hope you realize it. He sounds like he’s never content and you’ll be paying for it as long as you indulge him. You need to break up and stay broken up because as far as he’s concerned you are always waiting for him. He needs consequences for his actions.