Can't decide whether or not to have an abortion

I hate to even be in this position right now, posting this. My ex and I split up about three months ago. It was a three year relationship, one of absolute hell in which he put through every heartbreak possible. We lived together and I finally left when he fucked someone else in my bed when I wasn't home. I got my own place and ended up meeting this guy on Tinder, who's extremely hot, but nothing serious. We had been messing around on and off for a couple of months but he lives out of state so only when he was in town for work. I never wanted anything serious with this guy, it was just sex and company. We usually always used protection until recently. He knew I wasn't on birth control and he still decided that it was okay if he didn't pull out, more than once. I took plan b both times within 12 hours of sex. Not long after he left, my grandmother died unexpectedly. My ex ended up coming back around, comforting me through her death, saying he wants to change and has been working really hard on himself. So I decided to give him another shot. This was about 3 days later. I ended things with the other guy and my ex and I had sex several times. Unprotected but he pulled out on time each time, except for once. I didn't want to take Plan b again and was literally kicking myself so hard.