Possibly. But realize that you’re dealing with a man who is already cheating on somebody else by dealing with you. Are you sure that’s somebody you’d want a relationship with?
I don’t have the statistics on this, but I’d be willing to bet that a person who began a relationship with somebody as a result of infidelity is more likely than not to find themselves in a similar situation. Is it possible that he wants a relationship with you? Sure. But it’s also possible that he manages to find new “girlfriends” before he breaks up with his old ones so that he’s never lonely. And there’s a good chance he may do the same thing to you.
Is it a foregone conclusion? Not at all. Maybe you are the right one for him. But proceeding with caution never was a bad thing. So maybe he does. Just be aware of what you’re walking into.