Sometimes we are more in love with being in love, it's flattering to know someone has feelings for you, but you should realize that you only started longing for a re-connection after you heard about these feelings! So what does that mean to you? Before that you were a happy go lucky kid. I'd say stick with that.
Well consider this old saying - Why does a pig that has been washed and cleaned go back to wallowing in the mire? Or why does an alcoholic that has been dried out go back to drinking? You were clean, and you were sober, so why go back and do the whole thing over again? Don't be played again. Cease and desist or you may be a good candidate for Jerry Springer's show - "Baggage".
I'd leave it. You need to work on your insecurity and jealousy. You broke up with her, she slept with someone else, and you're upset about it? You don't get to dictate who she sleeps with. Sure she could have slept with someone else but clearly she didn't want to. She kisses your friend BEFORE you ask her out and you lose all trust in her? She wasn't going out with you, she can kiss who she wants.
You only want to get back with her when you lose your virginity? WTF is with that.