baby’s dad wants nothing to do with baby

so i have a 4 year old son. his dad is with another girl but he came to my house one morning at 5 in the morning and things happened and im now pregnant. he told me he wants nothing to do with the baby, but we literally already have a kid together so basically he plans to just not be in our new baby’s life. he has 3 kids with three different women. im the 2nd babymama and he’s still with the 3rd one. i didn’t make this baby on my own but because he has a girlfriend, he wants nothing to do with the new baby.

i know it’s a messed up situation and i know that im not innocent in this, but he doesn’t want to take ANY responsibility for coming to my house in the middle of the night (i didnt ask, he showed up while i was sleeping and woke me up and i stupidly let him in) and not using a condom and getting me pregnant.

what would you do in this situation? and i personally would never get an abortion so that isnt an option here.