i am going through the EXACT same thing that u are.
what i did was find a new group of friends and when i do something with them ill give joe(sorta best friend) a call so he knows that im still including him and if he says no or doesnt answer the phone, theres no guilt on my part.
and if he says yes, then youll have a funner night.
(is funner a word or would i be more fun?....defintely not rellevant but both of those sound weird)
if u ask for my myspace profile url i might just give you it