yes yes and yes.
it was so fleeting when I was doing my A-Levels, I spent a really intense time with a guy and when we got really close one night (having been reliably informed by his friends that he has never been like this with anyone), I woke up in the morning, freaked out and ran away. (ok so not really setting the romantic scene here, but we were at a festival) and he came and found me and I ran away again. As soon as I did I regretted it. But by the time I found him, he had just produced this wall of relative silence which I since, have never been able to penetrate. He got a girlfriend about 3 months later and they are still together. (some 4 years later?) I tried to make amends but I was too late, it was stupid because I don't even know why I ran away but I did. I don't regret where I am now, I have the most amazing boyfriend I could ever hope for, but I do regret not taking that chance and having that experience which would, I reckon, have been incredible.