PLEASE HELP best friend having sex with my crush?

so there's this guy named skye. i spent the night at his house and it was absolutely perfect. we laid in bed all night and had a deep conversation and played around like little kids. it was literally the best. we had sex that night and im not sure about him but it was definitely passionate to ne. it was the best i have ever had and i couldn't walk for two hours after. well that night i really fell for him. the way he looks, the way he acts, just who he is in general. he's my dream boy. well he doesn't feel the same about me. i did something dumb and messed it all up. well i told my best friend about him. she knew how much i liked him and how much he meant to me. she seen me cry over him for hours at a time.  well tonight she send me a video of his truck leaving her house and on the video it said "i got some girllll" . im so hurt and angry that she would have sex with him even though she knew i wanted him and how i felt about him. what should i do? im not ready to let him go for some reason. but i can't believe she did that. if i would have don't that to her then it would have been hell. i don't know why it's okay for her to do it to me. and when i confronted her about it she got mad and said it was someone else. i know it's not because skye has a one of a kind truck. im sorry i just need reassurance and i want to know what y'all would do? please help this hurts soooo much! thanks