FIANCEE HAS FEMALE FRIENDS CALLING AFTER 10PM?

Well Im sure there's more to the situation so all the advice I can give is if he ends up seeing her I think you should go along and meet her in person. But don't bring the late calls up because that's his issue and he should be the one taking care of that. He should be the one to tell her that its not okay to call so late and often (does she call often?) Idk but she needs to back off a bit and your fiance needs to know that it bothers you and if he cares he'd do something about it.