He only contacts me to hookup?

Every weekend he messages me with just a x in the message. If he hasn't got his kid he will ask in a sexual way to meet him at his. Never contacts me during the week and I'm actually fed up with it. it actually feels like I'm last resort, the ones he wants to be with are unavailable so he messages me instead. I see him online he doesn't contact me so I contact him it's a few messages then radio silence until he contacts again. This man is middle aged not an insensitive 20 something male. now I'm not for ghosting so what's some harsh words to tell him when he messages again that how he treats me is unacceptable and I no longer want to be used that way?

He only contacts me to hookup?
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