I would be flattered that of all the women he has met, he felt comfortable enough with me to make that move. Secondly, it would also make me feel secure that he isn't someone who is out to sleep with everyone... So overall I would probably view it as a positive thing.
I'd never know if you are lying or not so my opinion would be that he's not the right guy for me and that he is giving me a line in order to fuck me. It's not that I'm a difficult one to fuck. I love sex but I don't love bull shit artists