ex-boyfriend

Is it wrong to just have sex with my ex when I really want a relationship?

Oceangirl4
asks:
My ex boyfriend and I are really close and sometimes make out with each other when we are alone. He used to really like me still and I didn't feel the same way and now it has reversed and I really like him again but he doesn't want a relationship. We have talked about just being friends and doing stuff but is this wrong?...