They say, keep your friends close and your enemies closer. What about your frenemies?

With my 10 year High school Reunion looming, I can't seem to get old friends and enemies out of my head. In today's overly connected society, people can find you easily, and it is your fault.
Two years ago I created a MySpace page because I friend asked me to. Now with the reunion, old classmates are finding me. Well, not only through MySpace, but also through classmates.com. Again, something I did to myself.
I was really surprised when a classmate I wasn't really friends with contacted me through myspace. It was a pleasant surprise. She married her high school sweetheart and moved out of state. Very nice story for a very nice girl. Adding her to my friends list opened a door I'm not sure I was ready to open.
My family moved to Oklahoma when I was a freshman in high school. My association with Band brought me instant friendships, however, there was an outcast. Everyone told my to stay away from this girl. Rebel is my middle name and I took her to be my bosom buddy. For 4 years we were inseparable sisters and then . . . who knows.
A boy I didn't know, but liked, asked me to prom. What?! Someone asked me to a dance, on a date? Doin' a little jig here folks.
I had been "seeing" a boy who attended the local college, but we were not exclusive. I stopped talking to college boy when this young man asked me to prom. For reasons I still don't understand my best friend told my prom date that I was seeing a college boy. My prom date dumped me. It still hurts me when I think of this. I was incredibly disappointed and stunned. If he liked me, why would he do this? I didn't have a reason for a few days. Then college boy called. Apparently my B.F.F. told college boy that I was seeing high school boy. College boy wanted me to know he wasn't upset by her news but thought I ought to be concerned with her behavior. I was. By the way, still fondly reminisce of the college boy and his roommate. Two finer gentleman you will never find. They were so . . . thoughtful and concerned for me when my best friend turned. Until my husband, I never knew such fine men.
I digress. After my "best friend" ruined prom, I didn't talk to her for a while, but we pseudo patched things. Eventually, our relationship couldn't withstand the strain of betrayal and it withered away.
She has made contact with me through my stupid MySpace account. At first, I was excited. She is twice married and her current husband is a looker, just as she has turned out to be. The more I think about it, I wonder, why do I want her back in my life? Do I want to let this person back in? For now, yes. I made many stupid, horrific mistakes in high school. Some make me flush to even think about, stupid, stupid, stupid. I don't know what to think. For now minimal contact is fine. Besides, she is over 400 miles away. Oh crap. Not helping me relax. 400 miles makes damage control very difficult.