This is a song in which he is justifying his infidelity. He has come to regret moving in with his girlfriend --wife?-- and he feels that instead of choosing her, he should have chosen the girl he has resorted to seeing when he goes out. Or maybe he feels like he coasted into it on the strength of her feelings, and didn't make his own choice about it when he could have. But it's too late now, he is committed. And he is terrified of seeing her when he gets home.
This is a song in which he is justifying his infidelity. He has come to regret moving in with his girlfriend --wife?-- and he feels that instead of choosing her, he should have chosen the girl he has resorted to seeing when he goes out. Or maybe he feels like he coasted into it on the strength of her feelings, and didn't make his own choice about it when he could have. But it's too late now, he is committed. And he is terrified of seeing her when he gets home.