Should I apologize tomorrow?

ok well my use to be best friend for life sebastian changed compleately after he met this guy robert.
ok it started off as me and him being best friends and then even more best of friends. eventually people thought we were going to go out! but then he met this guy robert and compleatly changed into a jerk!!!
well robert and him started hanging out even more and eventually he bacame his best friend and I got pushed back.
soon to find out someone told me that robert hated me and was talking about me.
so I asked sebastian if he heard him saying anything about me and he said no.
then the next day robert walked by me and called me something and I saw sebastian right behind him listening and looking at me from the corner of my eye.
I fliped out on him the next day because he told me before if he heard anything that robert said about me he would say something to him so .. I talked to sebastian and he said he didnt want to talk to him about it. so I just left and we stayed mad at eachother.
the next week or so I new that he was changeing and I found out that he changed and didnt say anything because he wanted robert to stay friends with him.
so then he told me the next day that he wanted nothing to do with me and he didnt want to talk to me anymore and he was acting all rude to me.
so I stoped talking to him and didnt bother him for the next 2 weeks.

then I was on myspace and this girl that I didnt talk to that much heared about our fight and told me that he was talking to her all nice and when robert walked over to him and he just started making fun of her joining in robert started making fun of her!

I couldnt belive that we started off best frineds for life and ended up like enemys!

I could use some advice by tomarow morning so I can go to school and face him...
should I say im sorry.. was I right to do that.. what should I do... what should I say to him???

please !!!

You sound like you care a lot about your friendships. If you would like my advice, I would say to get another friend. I say this because your friend sounds like he is trying to impress this new guy he just started hanging out with. I think if you leave him alone long enough he will figure out on his own what a jerk he has become and if he cares at all, he will look for you eventually. I think you should just ignore him, he will come around on his own especially if that new guy he's hanging out with is trouble. Eventually, what goes around will come around, don't sweat it sweetie always stay cool and all will go well.

It sounds to me like sebastian has made his choice; he should apologize to you, but I doubt if he will.

What do you have to apologize for? If only for losing your cool, that would be OK. Perhaps you could tell him that your feelings were hurt.

It sounds like you need a new friend. 8^)