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You have picked yourself another winner -- a man who is abusing his wedding vows and his wife's trust. I guarantee she doesn't have a clue that he's less than a model husband who is cheating on her.
He's also abusing his kids' innocence by risking his marriage to their mother with his meaningless fling (and again, I make you a gurantee: His fling with you is meaningless to him) with you.
He is also abusing you by taking advantage of your vulnerability to get you in the sack, which is all he wants from you. He doesn't love you or care about you. He doesn't give two hoots about you. You aren't special to him. There is only one person in the universe who is special to him, and that is the person he sees when he looks in the mirror.
He's feeding you a line of bullshit so that you will service him. See HIM for the abuser HE is, and get out now.