Should I respond an old High School crush..?

In school I was a quiet chunky guy.. I had a crush on a girl and I finally mustered up the courage to ask her out and she rejected me.. now I'm 22.. I have a clear future with reachable goals.. I have an athletic build now.. Iv also grown to 7'0 tall.. Iv had a few flings with attractive women but nothing serious.. Now suddenly iv been contacted on Facebook and am being flirted with by the girl that rejected me in high school.. she has two kids now and isn't as attractive to me as i once found her to be.. but a part of me wants to date her.. i guess the chunky pathetic high school version of myself wants what he couldn't get.. on the other hand.. i could reject her the same way she rejected me.. what would you do?