We've been good friends since i started working there but things have been quiet of late - now i find out he has invited mutual friends to his stag do and i didn't even know he was having a party. I have no idea why he would leave me out and feel quite hurt as a result. I'm not the sort of person to go in all guns blazing - but feel that i need to register my disquiet with him. Has anyone been in this situation before, or have any suggestions on how to tackle him?