Most Helpful Guy
You could just not respond.
Most Helpful Girl
He doesn't keep coming back, you keep letting him come back. You already know what is happening here, you are allowing him to use you. Just because you care and are sweet doesn't mean he is. Most guys, if offered sex on a plate will indeed take it. You should never sleep with an ex, now he's getting all the benefits of a relationship without any real commitment and you're allowing this to happen. I can understand that you love him and like being close to him as it settles some of the hurt but you are only digging yourself a deeper grave by allowing him to stick around. You could speak to him about it and letting him know how hurt you are, this is probably pointless as if he cares about your feelings he wouldn't treat you like this. Or you could just move on silently, he will chase you but you need to be strong enough to walk away. Why explain anything to someone who could care less about your heart being in pieces? People like this can't feel your pain because the pleasure they get counteracts it. I feel bad for you and I'm sure your an amazing sweet girl and you will find someone who will treat you right. Just never do friends with benefits or sleep with an ex. You give all of yourself away and they get all the benefits without committing and also you get not say in anything.
Move on from this asshat- he isn't worth the sorrow.