I'm I in the wrong?

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Aye...So Im 16, in 10th grade and I have a best friend that ive known for a short time but we gotten super close. I tell him everything and Well..i thought he did too. Hes told me stuff about his family and relationships. Hes broken up with a girlfriend and hes trusted me to see her photos "wink, wink"...anyways Im typing this cause lately we havent been talking and hes been hanging with this kid i dont care for, and like he has a car so he gives my friend a ride to school. Me and this kid have had words before cause hes dating someone i consider family and then he got to her and had her stop talking to me and i went a little crazy and kept to myself for awhile..well like a week. Anyways me and this kid dont like each other and my friend knows i dont like him yet he still hangs with him and goes places. Now im not saying my friend cant have other friends but i mean..he could at least still talk to me some what..like a text a day or something...but another thing is that theyre in 11th grade and the prom is coming up and my friend has be acting weird and then tonight he said "i gtg, im picking out my tuxs" and like the kid i hate has a car and theyre girlfriends know each other and..i guess what im asking is, Im i in the wrong for being upset that hes acting this way and hanging with this kid?
Ive also started to have panic attacks when im on facebook cause i get notifications on everything,I feel like im going insane too
thanks for the help it means alot :|