Guy rescheduled hang out/date but I haven't heard from him in a week?

This guy that I met in college a couple of years ago has finally said that he is interested in getting to know me better (there's been an obvious mutual attraction between us, but nothing has ever come of it.) He knows how I feel about dating (I am petrified) and asked that I not think of it like that, but more of a "get-to-know-each-other" hang out. We had a date scheduled last Friday, but a few hours before we were supposed to hang out, he texting and said he was sick. I was kinda pissed at first, but then he asked to reschedule. Unfortunately, my schedule was already pretty full for the next two weeks, but he said he was willing to wait. I messaged him a couple of days later to see how he was feeling and we talked all night. That was a week ago and I haven't heard from him since. I know this isn't technically us dating or anything, but is it a red flag still? Considering he wants to get to know me, I'd think he'd at least reach out.

Guy rescheduled hang out/date but I haven't heard from him in a week?
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