Rick doesn't know why he married you, maybe it was because you looked so much like his dead wife, but other than that. He didn't really feel much for you, he felt as if he made a mistake for marrying you, because if his dead wife ever came back from the dead, he would instantly divorce you and marry her, he obviously would never tell you that, knowing that it would break your heart into multiple pieces made him feel...ignorant, but he was just like that, he couldn't help it.