Should i be with my baby daddy or sisters ex?

Let me first explain our situation... we hung out for maybe two months before getting drunk and having sex. I ended up pregnant the first time we ever had sex. Two days before i had a positive pregnancy test i ended things with him. I just wasn’t happy with how things were going with us. I feel like you just know.

Two days later i told him I’m pregnant. Ever since then he’s been really pushing for us to be together. I dated him for a month and ended up leaving him because I’m IN LOVE with my sisters ex husband. (I’ll explain that below)

My baby daddy is a good guy. He seems to really be into me and puts up with my mood swings. I just know he’d be a good daddy. I keep thinking if i can distance myself from my sisters ex husband then I’d be able to make it work with my baby daddy. After all, that’s the easier choice. I want us to be a family. I don’t wanna have to split up time with our daughter.

Let me explain the situation w my sisters ex husband. She hung out with him for literally a week, ended up engaged and married a month later. They were together for 3 months ALL TOGETHER. She ended up cheating on him multiple times so they broke up. She has told me and my family many times she was never in love with him. I have never met someone who is so perfect for me. It just feels so right with him. When we’ve had sex in the past, we make love.. and I’ve never felt that kind of connection before. Problem is,I can’t stop thinking about my future. Someday i wanna get married... how can i walk down the aisle with a man who also said “i do” to my sister?

My whole family, friends and coworkers have been pushing it on us. Even before we had even kissed or hung out much, my moms friends thought we were the married ones. Since the beginning everyone could sense the chemistry between us & always has told him he chose the wrong sister.

Should i let my sisters ex go? Is the fact that he married my sister a sign he isn’t the person for me? (I never would’ve met him if he didn’t marry her. He’s from South Africa and they met at the fair. I never go to fairs) my family was telling me he’s my soulmate BEFORE i ended up pregnant. Now my mom is really pushing for me to be with my baby daddy and seems to be more against me being with my sisters ex..... OR should i try my hardest to make things work with my baby daddy. Clearly god put him in my life for a reason, right?