Am I the only one who gets all the creeps?

So I had the most disturbing thing happen to me ever! My sister's ex-husband was visiting my other sisters boyfriend and decided that he would pursue me. I seriously hope that I am not being over reactive in that I think that is horrifyingly disgusting. I mean the rules say you aren't supposed to date a friends ex boyfriend but a sisters ex husband - I would think that is way off limits and my sister would have the right to shoot me on sight. She hates the man and doesn't talk to him do you really think she would talk to me if I shacked up with him? The mere though of it makes me want to throw up. He wasn't even subtle about it. He asked me out and then got my sisters boyfriend in on the game and they discussed in depth the fact that I should go out with him. Oh so horrible. He asked me multiple times and I basically let him know that I may be single but I know how to pleasure myself and if I really wanted a boy toy there are a few I could call up for a lay. He asked me if I was really happy single - he couldn't believe it because he isn't happy. I assured him I was very happy and not going to fall in the arms of someone just because they were convenient especially not ex husbands. Fuck that. I told my sister Sandy (his ex wife) about it and she said well he always did brag that he could get anyone of us he wanted. He had apparently said this to her current boyfriend - lol. She then thanked me for "schooling" him on that fact.