I am sorry you are struggling.

I looked at your other posts and it seems that over several years you repeatedly go for very wrong men. Unavailable, still dating others and sleeping with them while seeing you, abusive, still married to others etc I think you deserve way better.

Would you consider therapy to help you figure out attraction to these men? This guy doesn't sound like he thinks of you as best friend. Who knows what's his deal is. He does have a gf. I'd move on.

I am sorry about your mom. Hope she feels better soon