How do you feel about your ex and current SO hanging out together?

How do you feel about your ex and your current SO being friends. Not just cordial, like they hang out with each other. That my current situation and it drives me insane because at friendly functions my ex is always there and they interact with each other. I don't care if they can get along, that's nice. I just am very uncomfortable with having to see my ex around and then having my current boyfriend initiate conversation. He'll even defend my ex if I make a joke towards him or he'll sit with him and not me. But that's just my opinion. How do you feel?

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