I found out today that I wasn't invited to a friend's birthday event. It was a: "Oh, *'s had a birthday event that I wasn't invited to," I didn't get all angry or 'blow up' about it. Initially I was a bit hurt and disappointed that I wasn't thought of to celebrate her day.
It also transpired last night through conversations that the last 6-8 weeks haven't been 'quiet' but a lot has been going on in terms of get-togethers, social evenings, day trips out etc, etc that I wasn't invited to. I really didn't think much of that until I found out about the birthday. I suffer with stress and anxiety and I was having a bit of a hard time with it 2 months ago and asked my friends 'not to forget about me'.
It seems they did. 
I know I need to move on. I am hurt. This is a 'big group' of friends. I have another friend who was also snubbed in a similar way two months ago. She was furious and unlike me, not afraid to confront them. These 'friends DID lie to her. I was shown screenshots of things they were saying and claiming, and I KNEW they were talking bullshit. My 'snubbed friend' said that they were untrustworthy, liars, back-stabbers (you can probably catch my drift!) At the time, I was just 'careful'. I didn't want to fall out with any of them despite me knowing that they DID lie and do something out of spite against 'snubbed friend'.
So please tell me; how best do I deal with situations like this? I probably already know but need to hear it over and over again!