Whats going on with me

yesterday started off as a great day i had a blast at school i came home got along really well with aj and then i went to the senior christmas party and had an okay time the went to my new friend forrest house then came home. Thats when things began to suck i messaged my best friend telling her i fell down stairs  which i found funny when she didn't answer i decided to get on facebook... i saw that i had a inbox message so i read it. it was from my best friend's boy friend it pretty much said that i was no good for her and if i talked to her again i would have problems then proceeded to call me a lier and say i was dating the chick who i don't even know and he got her to believe it and then she told me she didn't want to be my friend anymore and that it would be easier on the both of us if we didn't talk to each other. this wouldn't have upsetted me if for one her fucking boyfriend wouldn't have told me what i can and cant do. for two if she would have told me in person instead of IM and three if she wouldn't have promised me earlier in the year that she would always be there for me. so todays school day was very long i didn't look at her nor did i talk to her but that i couldn't do i could barely tell people what was wrong with me with out crying.but all of my other friends were very proud of how i was handling it even if i had to beg them not to kick her butt. I'm just wondering will things get better or will i feel like im drowning forever?
Well thats all i have i would appreciate some guidance though so until next time
Love ya,
Elizabeth