She's being intentionally cruel to you by rubbing in your face the fact that she's moving on faster than you are.
Stop talking to her, don't e-mail her, don't call her, don't text her. No contact, period. Move on with your life because there's nothing that will piss a woman off more than knowing she has no more affect upon your emotions. Delete your Hyves account, unfriend her, don't talk to her. She's obviously being a bitch to you because you let her, and she's getting off on hearing you say that you don't like that she's doing this things.
Oh, and do yourself a favor. Go see a therapist about why you involved yourself with someone 12 years younger than yourself. Likely you have issues that you need to address personally before you go finding another serious relationship to attempt to commit to. She used you for a bit of stability, and then ditched your ass. In fact, I wonder if why she ditched you was because she felt you were trying to control her life...
"Well, then," the Cat went on, "you see a dog growls when it's angry, and wags its tail when it's pleased. Now I growl when I'm pleased, and wag my tail when I'm angry. Therefore I'm mad."