I have a BFF she can be quite harsh but she has been my best friend for over 13 years now. When she is annoyed by something or someone she tends to vent that to me. Not by direct words but the way she responds to things I say. She will not talk with smileys, she will punctuate her sentences, and sometimes even be plain rude.

In our early friendship she told me that's not my fault but hers. And every now and then she'll confirm that it's on her not me. But I always feel like it's my fault. Everytime she responds like that I feel so shitty so depressed and I just don't know how to deal with it anymore. 

She kind of decides my mood. If she is upset her responses to me make me upset. 

I am tired I don't want to feel anymore.