Break up

My partner and I have been through a toxic relationship. Even before we got together he was very hot and cold with me. I bent over backwards to help him after he crashed his car and found out on our second date that he had a baby due but wasn't with the mother as she left him after a few months. Fast forward a year after falling pregnant too soon we've had a bad relationship throughout. I've stayed through accusations of cheating, being called horrible things when arguing, told to have abortion...everything and I still stupidly stayed after being promised it would changed. A year later, our baby is now 3 months old and we've been through couples therapy and the therapist has focused on him in every session which shows me that how I have acted and been is not my fault. In a private session with her she even said if I told someone going through the same to break up then that's my own advice on what I should do. Most of my friends I've lost contact with or no longer have things in common now I'm a mum. My only family is my nan who is too old to look after my baby. I'm feeling completely alone and I've just broken things off after seeing he's been sending memes about cheating to a girl a few months before I was giving birth. I've also found him liking single girl babies and chats with girls while he was with me at the start. I don't know how I'm going to navigate parenthood on my own. I wanted a complete family because I didn't have one growing up and I wanted the best for our baby. I'm now seeing it's time for me to call it, which I did last night. I just don't know how things are going to be with no support. He barely helped with the baby, but it's just knowing I'm even more on my own with a house that's still not fully complete. Please tell me it gets better and things will be OK 😔