Damon would have stayed for Enigma but her fiancee was making a clear point of the fact that he didn't want Damon anywhere near Enigma, or him for that matter.
Without a word Damon turned to leave. He was used to be hated, and finding that no matter what he did, it wasn't enough to please some people.
He had done his part and healed Enigma and now it was time to get out of there.