Would you tell a guy that either we have a relationship or nothing at all?

I was casually seeing this one guy for quite a while. We ended it and now he’s back.
From what he tells me it sounds like he still wants the casual thing. I would like a relationship. I’m prepared to tell him either we are together as a couple or nothing at all.
Does it sound harsh?

Would you tell a guy that either we have a relationship or nothing at all?
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