He said he'd text me let me know but I'm still waiting for a reply. I think he's forgotten, What should I do?

Okay so I text me guy friend the other day asking if he wanted to hang out and he said he wasn't sure what was happening with work etc but he'd let me know. I'm still waiting for him to reply, and I get the feeling he's forgotten all about 'letting me know'. what should I do? and how should I react the next time I see him? Should I tell him I'm hurt?
He said he'd text me let me know but I'm still waiting for a reply. I think he's forgotten, What should I do?
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