Help i do not know what to do my best friend cant get it acros her brain?!!!!?

Okay so i have been best friends with allison for about 3 years now , i love her to death and i wud fall apart if i lost her.... She has a bf for the past two years they have been on and off tge whole time , they love eachother so ******* time she completly forgot about me . If i wud be standing like 5 freakin fee away from her she would rather suck faces with her bf and its so annoying at times , cuz when i need her and i need to talk to her like girl drama she gives me like 10 min and then go back to makeing out with her boyfriend or being next to him or being all wrapped up in eachother , i am might feel a bit jello of her and her boyfriend that like he gets way to much time to be with her , but its not fair cuz if not for me and holly she wud have never ended up being with this guy i convinced him to go out with her now they are inceprable , even when they are apart tey ******* text the whole time jeeez wht the hell do i do , believe me i ttyed talking with her. But she like foesnt get it , she makes more time to hang out with her 2 other friends which are my friends also only because those girls are friends with her bf and his friends , all i want is to go back to how it all was . Me and her wud hang out every weekend and text all the time , she doesnt even hamg out at school with me and her excuse i she doesnt kno all of the people i do ,,,,, idk what to do