I don't think that Gary wanted to Marry Abby. He married her so that he wouldn't keep hurting Val. He knew that as long as she thought there was hope that she would never move on. I think that maybe one of the most unselfish things that he has done. Although, Gary lived most of his life through Guilt. He thought about some one else. I think that is commendable. They didn't anticipate that later there would be 2 bundles of joy to link them back together. True love..