I feel like i have no one cus im stuck in a horrible sittuation please help?

Ok its a long long story but i met this girl from work about 2 years ago we were cool for about 6 months then became good friends then i met her boyfriend and then we became cool so it was the 3 of us and everything seems fine but now it seems shes becoming really selfish with everything she only cares about her self shes bitchy...never stops complaining about anything shes become severely jealous of me and especially jealous that i cant even talk to her boyfriend but the thing is she never tell me this it comes from him o she says i cant talk to you...hell tell me things like she goes places with him and never wants to invite me she never wants to go anywhere the 3 of us...but yet when her and i are together she treats him badly they always fight like cats and dogs and i always get the bad end...i feel like im always walking on eggshells around them i feel like i dont have friends because its always fighting on surrounded by jealousy we have been friends for 2+ years and they are all i have i try to make other friends but i keep going back to them but im miserable i feel like someones always lying like for instance we are going on vacation next week its been planned for 2 months its only been canceled like 5 times and the 2 of them fight and its for my birthday and i dont even feel like they wanna go...why am i so miserable and have miserable friends? what should i do to fix it