Friends with benefits tips?

I have started being in a friends with benefits situation. We are both divorced and looking for satisfaction, he’s very sweet and nice. When we met the first time, it seemed like we knew each other and we just clicked. I told him I’m currently not in a relationship and I have no expectations of what will happen between us. He told if I ever met a guy then we can immediately end this. Now I feel a bit attracted to him because he’s sweet and we talk about deepest things. So how should I set boundaries?
Friends with benefits tips?
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