Yeah, this situation is more of a function of your aunt's ex than a reflection on you. Honestly, if I was your aunt, I'd be thankful that he fully declared himself to be a creep and a bullet dodged before legally binding herself to him. He made many bad decisions... aside from sleeping with someone who's barely legal, he failed to recognize that action was going to poison the well so-to-speak with your aunt. He should've never re-entered a relationship with her after that. Surely this is a big lesson for you, but he's the one who should've known better. He should've turned you away.