In the film version, when Mary is being questioned after she decides to come clean about the whole thing, John Proctor is seen hugging her and comforting her throughout the scene, as if he's saying, "It's alright, you're doing the right thing, everything will be okay."
Before that, when she came in from the rain, he helped support her off the ground and clean her off. It really seems that Mary's courage has made him regret his earlier anger-induced abusiveness toward her. It makes what comes next all the more tragic.
The Big Damn Kiss at the end between John and Elizabeth right before the former is sent to the gallows. Elizabeth had just confessed to John that her crushingly low self-esteem never permitted her to believe he truly loved her. She will never doubt it again.
