Friend got a girlfriend, threw me away like garbage, am I wrong to be angry?

I understand where you are coming from. You're right it is very wrong of him to be rude to you. But maybe sinking to his level wasn't a good idea. Also if you step into his ex-girlfriend's shoes, she did not know that she was sealing him from you! so you can not blame her for that. As long as you tell him how you feel in a mature voice he will understand.