Emailing list

For the last 3 weeks I have been feeling a little blue but am not sure why. I am usually a really happy person but I guess we all have our bad days. Usually I just become a hermit till i work out what is bugging me and then I take steps to fix it. Anyway after two weeks lying on the couch and still no closer to working out why i feel this way I called my friend and asked if she wanted to hit the town. She said she didn’t feel like it but then decided that she did after all. Eventually I told her I’d been feeling a bit blue and her responce was this “Don’t drag me out if your not in a good mood”. Anyway I said I was tired and went home and I feel much better now but what she said still bugs me. I have listened to her drama’s my whole life (and there are plenty of them) I have never told her when I’m upset, cried on her shoulder or anything ever. Anyway she is supposed to be my best friend and we have known each other for 10 years (we are 25 and grew up next door to each other). I still like her, she is funny and has a lot of good points but to be honest I’m starting to think this friendship is all one sided. Do you think I should just acccept that this is just one flaw and still treat her the same or should I start to weed her out of my life slowly? In the past year their have been a lot of instances that have annoyed me. Example - we had an argument over washing powder which turned into her emailing me a list of all the things she hates about me - such as my thighs are fat, I have no fashion sence. (she still deny’s she sent this email - she reckons her boyfriend had her account password and that him and his mates sent it) I’ really don’t think this is true as I know him quite well and we have never had a problem.
Sorry, we all are getting sidetracked byt the emai/ boyfriend example - am more interested in what happened the other night - but thanks for your answers anyway