I was sleeping with someone for a couple of months who I considered to be my boyfriend. We arranged to go out on my 21st Birthday with a group of friends from work when I turned up at the club the queue to get in was massive and I had to wait ages to get in. When I eventually got in I went to meet him on the dance floor and he was snogging another girl from work
I left with my housemate and got steaming drunk, I was heartbroken because I was so young. Not a great 21st, memorable for all the wrong reasons.