My Best Friend (& Husband) is a cheater (Updated)

In 2008, my now husband and I became best friends. We were inseparable. Fast forward to aug 2015, he and I started dating and thought we were perfect together. We went on vacation (Disney World) for my birthday in 2015 and 2016. We got married in oct of 2016. The happiness we had started to fade in 2018 when we both became consumed with work and school. We were trying for a baby in 2017 and nothing happened after a year, so that was left on the back burner. For the last year, the communication and trust was not there because I constantly asked for him to be here with me, but he chose to put work and other people above me. It got to the point where we slept in different beds, saw each other for maybe an hour a day. Or schedules were completely out of sync. On July 2nd, I kicked him out because he was doing some dangerous things and did not want anyone around me to be in danger. On the 4th of July, I get a phone call from his cousin, telling me, he was sleeping with a girl I had already heard about in April. On April 1st, a guy my husband worked with reached out to me to tell me he was sleeping with a girl he was training. I confronted him about this alleged affair and he denied it. I believed him because he’s my husband and I thought I could trust him. He had been acting strange and disconnected during this time. After his cousin called me, I confronted him again and he told me he slept with her once and was hanging out with her, since April. He claims he wouldn’t do it again and that he only wants me. I don’t believe him. Nor do I know what to do. I feel like if we didn’t have so much history, I could leave and never look back. But I made vows to my best friend and I feel like I have an obligation to at least try to work things out. I am at a loss. One part of me wants to help him become a better person and the other is just completely devastated. Everyone thinks I should just throw him in the trash and walk away. And I understand why. What he did is wrong on so many levels.

Kind advice, please? Or kind words?

Now that his brother, cousin, and the girls best friend have told me everything, his mom reached out to me yesterday calling me every name in the book and that was the last straw. It’s one thing to cheat, but for the mother of the cheater to come at me sideways??? She must’ve been taught (and taught my soon to be ex) that it’s normal for men to cheat and we should just get over it. I guess my lazy, junkie ass (who is graduating with honors this fall) should stop going to college and start working in the family business of pressure washing. It’s a classic case of projection. All I ever did was try to get him to go to college and be a good human. 🤷🏼‍♀️ ohhhh well.