I was in a situation like this about 6 years ago. I think the best answer is one that communicates that you're fine on your own unlike him
The man who did this to me, when we met, he really presented himself as a free spirit, didn't want a relationship, but we met up, a lot, and then I gave him the girlfriend experience (although not that much sex, but maybe he wasn't that bothered about sex, it was the girlfriend experience he wanted). But he definitely did not want to be accountable to anybody or faithful or to have to consider anybody else or discuss his plans.
It all came to a head when something he said about another woman punctured my cognitive dissonance. He was angry with a woman he'd been messaging because they'd hit it off online and when he suggested meeting, she checked out his profile, saw he wasn't interested in a relationship and she messaged back to say ''sorry, for me the point is a relationship, not necessarily serious right away but a relationship nonetheless, it's been fun chatting, good luck''
And he was so angry that another woman had a bar, that she had her own agenda. He wouldn't normally have told me about messages he sent to women online but on this occasion he must have felt so slapped down that he told me about it, with the narrative that she was so sad and ridiculous, to not meet anybody if they weren't in to a relationship. He was mocking her nearly. And the scales fell from my eyes. I thought, wow, this is a woman who will get a relationship, because she is not filling her life with assholes who'll use her for the girlfriend experience!
So I called time on whatever blurry boundaried ''friendship'' we had and he was dismissive. Wouldn't accept that he'd done anything wrong. Disappeared altogether.
Ages later I did look him up and we met but I just saw this sad deluded boring character and I wondered why the fuck I'd thought he was so great. It's a mystery to me now why I elevated him to some high status. I'm worth twenty of him.
So, OP, get distance. Do not message him. Move on.