Will they changed their mind n attitude?

I'm really2x dissapointed with them..How could they do this all..Until now,i believe them..but, what i got just a something that we called"kacang lupakan kulit" in malay phrase..i never touched their heart with something bad manners.I know that friends responsible is more important than everything..but,why they do this?I didn't know is it i can forgive them..