He wants me to leave and take the kids.

We have a 15 month old he was doing so well with but lately he's been mentioning how he's too young for all this stress and responsibility and hes been acting up being super selfish, hes 21 and I'm 20. He came to the conclusion he wants me to leave and take the kids full time and he just gets them "whenever he wants". I say kids because I'm 12 weeks pregnant with his second. After everything this guy has done to me from cheating, lying, being so mean, ect, this tops them all. I have one more hour of work left and I can barely hold it together and I'm counting down the minutes till I can go to my car and cry my heart out. I feel so bad for my kids having a dad that just decided he does not want them. I have the sweetest little boy too. He's literally an angel and such a good baby and does not deserve this especially with him being such a daddy's boy. I have not had an easy life and I just feel like I can never catch a break but now more than ever I have to hold it together for my babies since the dad is ditching. I just needed to vent.