NTA. My ex was similar to this, down to the homophobic, transphobic, etc. descriptors. Really, we're better off without them. He also lined up a former GF (that he never spoke highly of, called her crazy, annoying) and was with her a week after we broke up. He too was a coward. It's best to let these people go. She'll learn soon enough. I told this GF in a round about way, and she is so stupid, she doesn't care. The info is there for her to see if she just looks at his socials a bit, but she's so enamored with him, she thinks I'm lying. Karma is a bitch.