Yeah I agree - a guy telling me he's "head over heels" after only a week or two freaks me out because, of course, he doesn't actually KNOW me by that time, so it's just about the FANTASY of me.
It doesn't make it bad - necessarily - because we've all met partners that we were wildly attracted to from the beginning. But as adults with some experience, a little caution is called for. Just keep your eyes and ears open.
