I am a widow. Friendships, I learned, are not immune to grief. Despite what you may think, some friends will leave you when you need them the most. Perhaps they don't know what to say or how to act. After speaking to people in similar situations, I now realize that in many cases, friendship and grief do not mix.
If you are doing well and the other person is not, jealousy can raise its ugly head, eating away at the bones of the friendship until they are raw and bare. And while I hate to speak ill of my sex, sometimes with a group of women it feels like we are back in high school. Well, I've graduated and want no part of it.
After a breakup, remember, there was once a 'you' before you became a 'we.' You'll recall that there was a time where you were fully whole -- without anyone completing you. There was once a time that you created community, family, stability, and security all on your own.