I'm not sure if i am right or not, but would you extend the basic courtesy of acknowledging a friends birthday?
My W did not contact me at all on my birthday, nor attempted to help our son get anything for me and i felt that lacked any class at all, regardless of our current status. After all, i will always be the father of our child.
Don't worry that the decision is difficult to make, but make A Decision and stick to it.
Ed
Me, 55 W, 36 T, 10 yrs S-9 M, 8 yrs 1st D-Day, 9-27-2009, With 1st bf, ea/pa 2nd D-Day, 12-5-2009, With her best friends bf, ea/pa W, AA relapse early 2009-Current W moved out 2-16-2012 New OM 5-2012