here it is anyway ! 
My DH and I have a couple of good friends. They came to our wedding etc - only a handful of guests and we went to theirs (a big affair) so we are what you would call close friends. DH has known them both since school and through family friends respectively so long history with both from before they got together. I only met them through DH about 6 years ago.
< disclaimer - this is not a wedding thread !! >
The woman is a real social and career ladder climber/ very go getting and materialistic but a very good person and generally a very good egg - works in the medical profession. Her DH is more like my DH really - both in building trade and very down to earth. My DH (affectionately and in fun) calls friends DW 'council estate made good' or 'a snob' on occasion when she is being a pain about some miniscule detail in her latest 'project' on their already fantastic house for example.
So whats been happening of late is this - and I'm buggered if I can work out why it is annoying me so much.
DH and I have no plans for the evening except for watching something on TV, maybe a bottle of wine, curl up on settee etc. DHs phone rings - its this best mate asking him 'fancy a pint?' or 'can you get a pass?' or whatever. Now this is always because best friends DW has either 'chucked him out for night' as having some girl friends round or she is going out with workmates to some do or seminar or whatever.
Now - I know , I know , I know , I know !! - why on earth shouldnt his best mate of many years ring him up and ask him to go out when he is at a loose end? But I am becoming increasingly resentful every time this happens. I nearly always say I dont mind and 'off you go- enjoy yourself etc' as I am not a nagging or clingy wife and would hate to start acting like one but then I end up unexpectedly spending the evening alone - which I dont mind per se and am happy with my own company/can entertain myself etc.
The other night I blurted out when one of these calls came (have no idea if DHs friend overheard me)'Oh I take it 'Dhsfriendswifesname' is going out is she so I get to sit in on my own again do I ?
I mean WTAF - this is so unlike me.
Go on then flame away.