My boyfriends mom and her best friend have had a joke for years that their kids were gonna get married. My boyfriend is really good friends with her (which I'm fine with) but he is always talking about how great of a person she is. I am kinda jealous of the way he speaks of her. He keeps telling me that they are just friends, and they live hundreds of miles apart, and that I shouldn't worry about her but I do anyway. Should I worry and be upset, or am I just insecure.