Why is my husband talking to his ex-girlfriend?

[M.]

YOU SHOULD BE WORRIED... look at like this

you two are having arguments, he is getting frustrated, thinks what is the problem talking to ex gf .. then this leads to more, he thinks o my ex gf isnt giving me any problems. this can lead to more problem for you and him

staying in touch with ex bfs or ex gfs is UNHEALTHY for any relationship .
you need to confront your husband about this. tell him why he is doing this tell him how it disturbs you and how he shouldnt be doing this behind your back he shouldnt contact ex gfs it isnt healthy for your marriage. talk to him about your problems and tell him you both need to resolve your issues and move past this argument and dispute. ask him is he acting this way since he is talking to his gf. tell him how could he even be speaking to her when your together he should not be doing this there is no accuse.

he will use ever play in the book to excuse his behavior, tell him it is either you and him stopping or else. tell him this is lack of respect for you and both of your marriage. tell him you will not tolerate this what so ever and you dont deserve this. tell him you married him because of his love and commitment and this is a form of cheating. it is not way sexual yet but it is emotional. tell him something he wouldnt do with you over his back he shouldnt be doing at all. and it pains you. ask him if he loves causing you this pain.

just be ful front about this tell him he has to stop there is no point of him rekindling with her. what does he want with her, to see if his life would be better ? to get closure ? what because honey for any marriage , past relationships.
just tell him he better end , block her no contact what so ever through email phone etc. his past relationships are his past and there is a reason for it all to be the past because you are his present and future. he proposed to you and married you because he chose to commit and be with you for now forever.

he ends it now with her or your marriage with him will end. ask him you are not going over board or anything he decides does he want divorce papers or you. tell him if he really loves and respects you he wouldnt be doing this for any reason etc.
you both should then make a pack to never end the day on a bad note. and just tell him you feel like his explanations are lacking.

good luck