Mine is a guy one too. Don't get me wrong, I'm really happy with my now DP, but when I was seeing someone before him I went on a business night out and met the IT guy of a client. We chatted all night and really hit it off. The next day he contacted me, via the client, to ask for my number. As I was seeing someone else at the time (who turned out to be a total commitment phobe), I declined.
He was a gorgeous, tall, strong, funny Aussie, so often wonder which direction my life would have taken if I'd just said yes.
In hindsight, my realisation of regret of not taking him up on the offer, made me see that the guy I was seeing then wasn't the right one for me. I signed up to online dating as a result and met my now DP as my first ever date on the site (I was still officially seeing the other guy at the time too, which my DP will never know - it was literally only for a couple of weeks, but it was very, very unlike me!)
Incidentally, I used to love the Sliding Doors film, but when it was on again a while ago I watched a bit of it. OMG that really hasn't aged well!