When I met DDs birth DF, it wasn't serious. We dated on and off for a while. After we slept together for the first time on the day after Valentine's day (literally minutes after), he left the room and I noticed a Valentine's day card from his girlfriend. We broke up. I found out I was pregnant very early on, and decided to keep DD as I was told I had low chance of having a baby (one fallopian tube removed and only 1 period a year). He told me he'd be involved. But never showed up for the 20 week scan and I didn't hear from him again. I tried to get hold of him when I went into labour, when she was born, and when I was registering her birth but I just got "ok." In a text. I stopped trying after that.
I have a wonderful DP, and he's really stepped up as a fatherly figure to DD. She knows he's not her birth DF but they have such an amazing relationship and I couldn't thank him enough. DP has frequently said, however, that if her DF came back into the picture he'd step back and give him a chance to be a real dad.
Back in April EX sent me a message asking how DD was. I sent him photos and told him how well she's doing. After about 5 messages he tells me he got his girlfriend pregnant. Since then he has shown hardly any interest in DD but updates me on his new baby. Sending me scan photos and maternity pictures. It honestly boils my blood. He added me on Facebook and posted about how excited he is to have his FIRST baby. Turns out he never told his girlfriend about his 4 year old daughter. The baby was just born. He won't leave me alone, bragging about his beautiful little girl. AIBU to just block him? It stops him getting in contact about DD but I doubt he would any way.
Disclaimer: I'm not jealous that he has a girlfriend or even that he has another baby. I'm just so angry that he gloats about his new baby to me when he also has such a stunning daughter who he doesn't give a flying fuck about.