I found out via Facebook that I had not been invited to a work colleague's wedding that everyone else had been.
There were seven girls at work, inc me of similar age, and we always had lunch together, until one of the girls started being rude to me. I decided that I wasnt going to put up with it, and started doing my own thing at lunch.
One of the girls of same age got married, and I asked another how the wedding had been that weekend, assuming she would have been there as these two girls were particularly close, but was told she hadnt been invited. I was rather surprised by this, as I'd already heard her mentioning how beautiful it had been to one of the secretary's. I suspected that she'd been trying to save my feelings.
Although I wasnt friends with this person, we shared a friend in common on facebook, and I could view her photos. I checked to see if she'd lied to me, and found that all the girls from the office had been asked, but me.
I'd already realised that I was not part of their click, but still hurt, as in my mind I'd always been nice to them, and when I realised they were leaving me out of things, just left them to it, deciding that I'd got a nice group of friends at home and didnt want to be pushy.
After this, I started looking for another job.