I share your pain. I am in the same boat. I befriended a person and then she took over my life. Now I don't really know how to extricate myself from her.

She constantly blows through my boundaries and doesn't seem to recognize they matter. When I put my foot down and tell her firmly not to walk into my office without knocking, and getting a "come in" she throws a hiss fit.

90% of all conversations are about her.

Everything I want is "silly"

I truly think that when you are a good friend people start taking advantage. The sad part is that there is no way to avoid this.. you have to be friendly with people... and then SOME people take it too far... and you can't really get away from them too easily.

I work with my person so there is only so far I can go to try to be rude. I now try to work away from my office a lot.