It's happened 4 to 6 times in my 21 years so far.
I'll go on holiday and I'll bump into a girl who completes me on all levels. Of course some times it was unrequited, but when it was mutual, I felt a sense of shame and of course sadness that I will have to leave them for ever?
It's really frustrating... maybe the UK isn't the best place to be for me lol