Any advice is appreciated

How can I protect myself and my heart further from my baby daddy not really caring about me while I am 31 weeks pregnant? He gives me support and says he loves me then disappears for days. I thought he cared but recently found out he was flirting with girls on a Tinder profile. It hurt (I am coming to see the truth in the situation) and I told him it did but he made it like it was just for fun. We don't live together, I do have a therapist, and I'm trying to figure out what to do as I got pregnant right away after meeting him last September. I decided to keep the baby as I was not able to conceive with my previous 12 year relationship and felt like it was indeed a blessing when it happened. Any advice is greatly appreciated. Please be kind as I am a bit hurt and emotional.