You are absolutely right I do need to get a better sleeze radar. I did over react but he did move on...possibly because he thought I was extremely conservative or because he was a sleeze who knows! But if you say guys are used to that then I won't worry too much about whether I'm over reacting or not in the future.
I guess it was productive.....I think H let himself get closer because of my change of attitude and also because maybe him thinking that I was dating meant that he could let his guard down a tiny bit that I wasn't interested in him anymore. its all mind reading though