I have a very good relationship with my DP of almost a year and we're talking about marriage. There's a fly in the ointment though - his ex-GF (they were only together about 18 months and there are no kids involved) keeps contacting him, by text mostly, and it's obvious she's still very much in love with him. She hasn't met anyone else since he finished it about 6 months before we met. She knows all about me and that he's very happy and he always tells me when she's been in touch and even shows me her texts (they're not really personal in any way but seem to be quite regular).
Recently she invited him to her birthday party and he asked if he could bring me, to which she replied absolutely not! I'm quite uncomfortable about it and feel that he should tell her that if that's the way she feels about me, then it's not possible for him to have any further contact. I'm pleased he shares everything with me and I trust him totally but this makes me feel he's being disloyal. I know that at the root of it is a dislike of upsetting people (he had an angry and abusive father) but I feel I need to let him know that this is upsetting me now.
I wouldn't mind him staying in touch with her if she'd totally moved on and was happy to include me but it's not like that. He also has a good friend that he made through her and would love to see very much but he's afraid to in case it upsets her. Also, we only see eachother once a fortnight because of distance - do I talk to him about this over the phone or wait until I see him?