How are you going to sort it out?
I have to be honest, he sounds like a bit of a cad. Anyone who genuinely loves someone else would not be able to continue in a marriage with someone else.
It's a case of put up or shut up.
You keep saying you want to be together but neither of you have made that step to make it happen. You also say on here frequently that you still love your husband.
You either still want to be married to him or you don't.
I think/suspect that this is tied up in some sort of trauma that you're going through at the moment? I seem to recall that much from your recent threads.
Don't make a lifechanging decision based on fuzzy logic to be with someone who doesn't sound as if he genuinely feels the same way. He isn't deserving of you.
Perhaps your husband isn't right for you either, who knows.
Ultimately, you need to be happy in your own skin to be happy in any relationship.
Rather than thinking about who is right for you, how about concentrating on making yourself mentally well first.
Have you got access to decent counselling at the moment?
Do you have any close family or friends you could stay with if you wanted to have a trial spearation from your husband whilst you sort yourself out.
I just don't think you can truly decide whether or not your marriage can work whilst there is lots of other shit going on.