Is it weird ex hangs out with sister?

My ex boyfriend and my sister hangout and apparently talk all the time. We’ve been officially separated for 7 months and I’m in a new relationship but my sister seems to consistently hangout with my ex. He tells her personal things too. They’ve never been friends when we were together and he has admitted he isn’t... show more My ex boyfriend and my sister hangout and apparently talk all the time. We’ve been officially separated for 7 months and I’m in a new relationship but my sister seems to consistently hangout with my ex. He tells her personal things too. They’ve never been friends when we were together and he has admitted he isn’t fond of her so why is he now one of her closest friends. I get that people can be friends with whoever but is it not weird..
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