Maybe it's a game. You know, the kind of game little kids play all the time.
You have a toy that you loved but got over it, so you move on to another toy. And the toy from before no longer has a meaning. It's out of your mind until you see someone else pick it up.
Then you want it again, so you go up to that person and start to fight them for your old toy because now you realize that it's your absolute favorite.
Maybe it's like that, you know? Maybe I only want you because I don't want anyone else to have you.
Selfish, I know, but I'm human and maybe I'm selfish because a part of me does love you.