I know I am!
Think I need to be handed a grip tbh! 
This is all probably going to sound very childish but I've just found out about yet another activity DS has been excluded from and it has really pissed me off
During pregnancy & mat leave a friend I knew, but wasn't especially close to, and I bonded. When our DSs were born we spent a lot of time together.
When our boys joined nursery DSs little friend suffered huge separation anxiety and my DS became his security blanket.
Over the next couple of years his domination of DS bothered us a little (he was very controlling and unwilling to 'share' his friend) I spoke to my friend about it who thought it quite funny and 'sweet' so I asked the teacher to keep an eye on it.
School were great about it and encouraged both boys to have other friendships.
3 years down the line and my friend and I have drifted slightly. Not fallen out, simply both returned to work and rarely have time to catch up.
The boys are still friends but it feels like his mum is being weird about the friendship. If her DS invites our DS to play there is often the promise of something else in addition (staying for dinner, sleepover) then in the next breath a reason why he can't. It's very weird but I try to convince DS that it was an unintentional mistake.
DS has another friend at school (who the other boy knows and likes) and the two of them are part of a club at the weekend. The other boy appeared to be quite jealous of this friendship and repeatedly told DS 'he is my BF not yours'
Now the mum has started having this boy round for sleepovers (sleepovers that were offered to our DS but never happened) and taking him on activities that we were previously invited along to.
The mum is also very cagey if I ask about plans, I ask as part of general chit chat on the school run.
DS isn't too upset at being sidelined. He has other friends and we do plenty as a family but it is really bothering me.
I'd speak to friend about it but realise I'm probably being pathetic.
So come on, start handing out the grips and tell me how I need to get over it!!