Need advice desperately.... please no negativity.

So long story short my fiancé & I were TTC for 7 months. We were together for 5 years, and we’re suppose to get married this fall. I thought we had everything figured out. He randomly ended it with me about 3 weeks ago, he was very hot and cold. & we did have intercourse in between. But I’ve become a master tracker these last months and was never concerned about falling pregnant because I thought I knew my body like that back of my hand... he pulled out... we only did it ONCE near my supposed O date & were careful 😭 and now I’m pregnant. now we are not on good terms, he is being very disrespectful & mean towards me. Saying a lot of awful things. I don’t want to ever have anything to do with him ever again. But now we have a baby together 😭 I don’t want to get rid of it because it is something I’ve always wanted & I don’t know if I could live with myself. But I don’t know if I can handle the fighting, being alone during this process, & the constant figuring out who gets the baby when :( even the thought that I’ll be pregnant all summer while he will be out living life, it does hurt. I still love him so much, & the thought of him hooking up & having fun while I’m sad and alone is so depressing to me. I wanted to experience this with him & idk if I can do it alone. It’s selfish I know 😭 please I’m looking for some positivity in this, or some kind advice. Nothing mean that I clearly already know.