I feel so helpless,as if im losing all my friends...?

I've been friends with my group for years and i love them all.I also love my boyfriend of two years,and we all have went out together and had a great time for years.One girl who ive also been friendly with for a while joined around a year ago,and she's made herself the unannounced leader.Anyway,ive always liked her and ive confided in her and shes done the same with me.However,after one night when we were all running about drunk,my boyfriend made a dent in her boyhfriend's wall.He instantly regretted it and offered to pay for everything.Now,she's leaving us out of everything,including parties,so i have to sit and listen to my best friends go on about how great the parties that we arent being invited to are,and she doesnt even have a reason to not invite me,even tho she's always talking about me.She's pushing me out,and i feel so helpless and upset about it all the time.Please help?