Damn… what a story! A similar thing happened to a friend of mine, but her ‘Tina’ was her boyfriend. A good looking and charismatic guy on the outside; trainwreck on the inside. He had dropped out of university, been laid off a few times, was let go by his modelling agency, and ended up being a pyramid schemer with ‘entrepreneur’ proudly tagged in his Instagram bio.
Like my friend’s ex-boyfriend, it seems like Tina was jealous of you and wanted to put you down to feel superior. Her jealousy manifested in trashing you to your friends. For my friend’s ex, it manifested in him cheating on her in her bed in her apartment. It sucks that you got caught up in someone else’s insecurities.