Please help me! Really needing emotional support

I'm hoping there's someone out there that's been through something similar to me. Please don't judge or tell me what I should've done. Some will think I'm stupid. Just hear me out.  I'm currently pregnant with a man who I'm so in love with, but we've been through a lot. We were friends for a while and at one point we decided to work towards being more than friends. So of course we started having sex, expressing our feelings a little more spending lots of time together. I was focused on him and the whole time. He made it seem like he had nothing going on with someone else but eventually found out that was a lie. Months later he told me he had sex with another girl and i was destroyed. From there we decided to work things out and officially be in a relationship and  be faithful because it just wasn't worth hurting each other any longer. Things were going good But 2 weeks later he tells me the girl is pregnant. We reached out to family and friends for relationship advice and they all believed we could get through it I guess because it's so apparent how strong our bond is. And we had been already building a connection for a year at that time, I forgave him already for having sex so I felt in my heart it's no need to turn back now. Before they're baby was here the relationship was hard of course but now their baby is born and it's been extremely hard lately. Some days I accept it and be strong about it some days I have flashbacks and cry about it. And the emotions are worse now that I'm pregnant. At the end of the day I really want to work things out with him. That's my best friend, my soulmate. We've moved together and now soon about to have the family that we've been dreaming of. Please is there any one out there that may be able to talk to me or share their story and help reassure me things will be okay like I know they'll one day be.