Do I leave him?

I've been with my significant other for almost 2 years. We were living together with our son who just turned one but I left about a month ago and moved in with my mom he stayed living in our apartment another month until he lost it due to money issues. Living together we always struggled with money he was irresponsible in that category he was a very mentally unstable person and would argue and fight with me in front of our son and get somewhat physical I finally had enough and left since I left he has been working hard to get mentally healthier and has even moved 2 hours away to start working and getting more money so we can live together again and I'm not sure I'm ready for that but I recently found out I am pregnant again so it makes things more complicated I love him but I'm not in love with him and I'm scared to Tell him. When we do argue and I threaten to leave him he threatens back and it makes me feel trapped every time I try to be open with him he gets upset and threatens to hurt himself its mentally and emotionally exhausting to me and plus I feel like I dont truly know him he's lied alot about his life that I slowly started to figure out I just don't know what to do I want to be happy and I want my babies to be happy