how can i show my bad friends!?

i just got back from college and these are my two 'best friends'. we were all excited for a reunion when i was away, but i have seen them once in 2 weeks, and one of them left early to meet someone else who lives in our town -- i've been away for 6 months, can't you wait 20 minutes before seeing someone you see every week?

then last night i got in touch with them individually to organize something and they ended up going out together instead and hung up when i tried to call. one of them just texted me in the morning like 'sorry don't be mad' -- but i am hurt and pissed off! they might just be jealous but these are supposed to be my two best friends.

oh, and i also found out one of them slept with my ex and didn't tell me about it.

how can i show them they can't treat me like that?!! i have enough going on in my life that i'm more annoyed, but still emotional.