fell apart tonight

my narc is having 40th birthday party tonight told me he was having one but said invites were not ready yet he's invited all his facebook women they are all there just now I'm the only one he hasn't asked 5 years I've been with him I can't stop crying is this the final discard why did he do this to me I've always been there for him how do I get back at him why tell me about parti and not ask me we hadn't fell out nothing I don't understand help me what do I do now do I go and shout at him after it's all over there is over 100 facebook women going all he chases I want to die did I mean nothing does he hate my why do this to me everyone else think he's great help me please party is now can't stop crying