I found out in July that my DP of nearly 5 years was having an affair with a work colleague. We live together and he has a DS who is 6 (who I adore) and he stays with us every other weekend. I had my suspicions he was cheating as he was being cagey with his phone, staying late at work etc, I found the texts to this woman on the ipad and confronted him, he admitted everything and said he wasn't sure if he wanted to be with me or with her. I went away for a few days to clear my head and when I returned he said he wanted to be with me and all contact with the OW would stop. 2 days later he changed his mind and said he wasn't sure and then eventually ended things with me, I went away to my mums for a week and when I returned he had changed his mind again and begged me for forgiveness, again 2 days later he changed his mind again and in the end went and stayed with the OW for 2 weeks leaving me devastated. I have never cried so much in my life. After the 2 weeks he returned and said he had made a mistake and didn't want to be with her, he said living with her made him realise that he wants to be with me and that she isn't the person he thought and thinks she is actually a bit crazy. I was wary so insisted we take things slowly as I couldn't bear it if he changed his mind again, we went away with friends on a pre booked holiday in September which did us the world of good and things started to return to normal. The problem is that he is still texting the OW, sometimes all evening leaving me feeling really insecure and terrified it will happen again. I asked him why he is still texting her and he said she isn't taking their break up well (poor lamb!!) and is worried she will do something stupid. I've told him so many times how the texting makes me feel and tried to get him to see it from my point of view but he says he feels responsible for her and the texting will stop soon. Today I just feel so sad and fed up with everything, I feel like I'm the one making all the effort to rebuild our relationship and because I forgave him so easily and readily that he will keep doing what he wants. I love him and his DS so much, I can't imagine my life without them, what should I do? Give him an ultimatum? I think about him and the OW all day long and it keeps me awake at night, I just want it all to stop. Does anyone have any advice?