Why would he keep me on snapchat?

A guy i hooked up with added me on snapchat and he opens/responds to my messages right away but doesn't want a relationship and he said he's not single but not married which I didn't know until after the fact, but I'm fine with that, but why would he add to me snap and chat with me when he don't want a relationship?

Why would he keep me on snapchat?
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