FTM doing this alone

Meech

So I was involved with a guy for the past 8 months and on May 5th he randomly decides to leave me to go and try to work things out with his first baby mother. They have 2 girls ages 4 and 2. I recently found out I am 7 weeks pregnant and he doesn’t want me to keep the baby. He has not been supportive at all and is threatening to be an absentee father. How can someone do you this way? I’m not sure what to do as this will be my first baby and I’m 38. I’ve always wanted a child but never planned to do it alone! I have the support from his sister but I’m afraid he won’t help me and he will prolly try to keep my child a secret so his other baby mother never finds out. So heartbroken…