DP has two young children whom he saw lots of when we first met. After a couple of year his ex stopped contact because she wanted alternate weekends and he couldn't do that because of work. He has done nothing to restart contact (ie via court) and it's now been 2 years. It was his daughters birthday the other day and he didn't even mention her, let alone send a card or anything yet was telling me how happy he is with my and our DC. I feel really angry for his DC and our DD who is missing out on a relationship with her siblings. I also resent that his ex may think he isn't having contact because of me when actually I've done everything to encourage it. WIBU to get in touch with his ex and talk about our dcs having a relationship?