Do you require your husband/wife to always ask your permission every time he goes out with friends esp when an ex-gf is in that circle too?

My partner and I let each other know if we have plans that don't include the other - even if only to give the other time to make alternative plans. Personally, I'm completely fine with him socialising with friends including exes. He tells me all the stories after anyway and it's a healthy exercise in demonstrating trust.