Just Wondering...

So a couple months ago I posted about wanting to leave my husband because I was tired of how he treated me and I got some fabulous responses and I got the courage to pack mine and my daughter's stuff, and leave. A week after that, I filed for divorce. Four more months until it's finalized, but I'm getting there. I'm also now employed and I will be starting CNA school at the end of the month. I'm starting my life. HOWEVER, there is one thing. My husband and I share a best friend. The best friend is a guy. I have had the biggest crush on this guy since I met him, but I was with my husband so I never did anything about it. One night, when we were drunk, we ended up having sex. Flash forward 2 months later, and we still are. And we make each other really happy. And my daughter adores him. And for once, I know what it's like to be treated right. We aren't labeling the relationship for a while, probably not until my divorce finalizes, which I'm fine with, but what I want to know, is if we are bad people?? I know he's my husband's best friend, but he became more of a best friend to me than him the last couple months of my marriage, and him and my husband don't really talk anymore either. My husband doesn't know about us, nobody does (except for my girl best friend, you know how it is ladies). But he's constantly feeling like he's a bad person or something because of the "Bro code" or whatever. I believe that people should be able to be with whoever makes them happy. Am I wrong??