I feel so dumb!

I just broke up with my boyfriend this morning. Im sad and definitely hurt. He begged me and begged and cried for me to have his baby. I wanted to wait but ended up giving in. . . Im now 10 weeks pregnant. . . found out recently he still talks to his ex, says its nothing. So I text her and tell her im pregnant and to please back off, just to make sure its nothing. No response. Found out this morning he is still talking to her and helping her out with bills!! AND deleting his texts with her. Am I over reacting? Ive told him it bothers me, they have no kids or responsibilities together, why does he need to help her? He should focus on me and the baby right? Someone please help me im so SAD right now. I am now alone and pregnant, and he left so easy! He must have wanted to leave right?