He is cleaning his sheets identifying with God. I think he sort of realizes what he has done and decides he needs to change because after having sex with Mrs. Doyle he gets sick and stays sick for a while gets better tehn gets sick again, I believe it is his remorse, in a way. In the end Mr. Doyle I dont believe he really likes Miss Lonelyhearts anymore, he comes over and Lonelyhearts sees it as his opportunity to embrace adn heal the crippled. Mr. Doyle reaches into a package that he is carrying and then tries to get rid of it and him and Lonelyhearts end up tumbling down the stairs. I conclude that Mr.Doyle was plotting to kill Lonelyhearts but fails thanks to Betty comming up and I believe she startled him so he tried to rid of the evidence. In the end Lonelyhearts ended up in a better state than in which he began. It seemed to me he gave up always wanting sex and settled for God, which in the end is always the better way to end up.
