Leftover Feelings

When getting over a breakup, you tend to have a lot of feelings, that all of a sudden you go from lovestruck fool, to a depressed hot mess.
Leftover feelings for exes are the wierdest things to feel. Sometimes, you feel that you miss that ex of yours at the wierdest times. Like when you are enjoying the main course of your new love life, and all of a sudden you want to eat the crappy leftovers of your past love life instead of the gourmet five star meal of the present. My question is why do we feel this strange desire that we want the person that screwed us up, the person that has hurt us the most, the one that has broken our hearts in many pieces. When they left, we eat tons of junk food, cry our eyes out, and feel like we've never meant anything to them. So after all of the bad emotion, why do we feel like we want the one who never wanted us?
I was talking to a friend of mine today. She was upset about kissing her ex today. I didn't know what to tell her, and it got me thinking. I came up with two solutions.
The first is that you should be smart, and stay away from him. He did you wrong, and therefore you shouldn't consider him to be worthy of you.
The second is that you should just give it another chance, after all, you're in highschool. The relationships that we have now probably won't be the guy that we are marrying. So, just have fun, and go with it, and it will all come to you. As the famous singer Conor Oberst once said "everything is a cycle, you gotta let it come to you. And when it does, you will know what to do."
So, let's listen to Conor. He has some good advice right there. Listen to you're heart, and don't stress.