Unfortunately they are usually the ones closest to you, people who you believe to have your best interest at heart, nothin` worse than a wolf dressed in sheep's clothing. That's what back- stabbing fiends are made of !
I've had this happen so many times :( Loyalty in friends is so hard to come by, but at least it helps you weed out the bad ones. The few friends I do have I'd trust with my life and that's worth the pain of finding out someone you thought was your friend never was.
The hypocritical friends you have did nothing but laugh at you and stab you in the back, now since you have something in common like the hate you share well now you are of use to each other. Betrayed you with your ex and the other constantly talked about how dumb you were for not knowing. Who is laughing now? Some friends you got there, wow I am so jealous! pfft get a life!! ~