I have a friend whom I've known since school. She was a bridesmaid at my wedding. She is single and I am married with children. I moved away but not so far that we can't keep in touch. She never contacts me anymore. For the past couple of years she hasn't invited me out for her birthday despite other mutual friends going. I'm sure it's because I'm married with children which is what she ultimately wants. I get that we are at different life stages but I just feel it's a bit of a kick in the teeth. I haven't said anything to her. Am I best just to cut ties? Or remain a distant friend? I still send her birthday cards and her to me.