It sounds like she is immature, narcissistic and either deliberately cruel or one of the most clueless individuals walking erect (she does, doesn't she?) The birthday card is the kicker...she knows you loved her, she knows she played you and she sent the card just to twist the knife. The saddest part is when you look back and see how much you gave to the relationship and how much she pissed on it. Not all people - of either gender- are that way. But just one can screw up the others for you for a long time. Take time to heal...but trust when you can see yourself through their eyes and see a person, not a victim. It's tough. It'll pass. Be easy on yourself. You won't forget her, but you CAN get over, past and beyond her. That's when you've won. And she may have learned what she has lost.