Next weekend my GF has arranged that we're going to eat with her grown up children at her ex husbands house - it's his birthday. Now I can understand her wanting to stay on good terms with him for the sake of the children (as I try to do with my own ex-wife) but I'm uncomfortable with the idea of eating at his place - they've been divorced for years so I'm not worried that she's still in love with him. But I'm also concerned that she never consulted me. Am I being overly sensitive?