He never initiates communication/scheduling dates. Is he just not into me? Should I see this as a red flag?

I (27F) just had the 7th date with this guy (35M). It's been 3.5 months since the first date. We're both looking for a long-term relationship (at least he told me so on the first date). On the first date he told me he's a bit workaholic and can't message much during weekdays. Sure enough he almost never initiates communication, he responds to me whenever I reach out but sometimes it takes 3-5 days to respond. He initiated the first two dates but since the third date I've always been the one that initiates scheduling the next date, but once we set the date, he always initiates making plans on what we do/where to go and he pays for almost everything. To be honest I don't really mind initiating dates and I find people who's invested in work attractive so I don't see his way of communication as much of an issue. But there's just so much dating advice I see on the internet such as "no one is too busy to check up on you daily" or "he is just not into you, you're wasting time so move on" kind of stuff and I'm not sure anymore. Is he just not into me? Should I see his behavior as a red flag and move on?

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Thanks guys. I asked this question because I didn't know if I should let the general dating advice or majority's opinion effect my values. I have a great time with him always, he is sweet in person and I personally don't need much day-to-day texting so I was happy and hopeful for the relationship to progress. But maybe that thinking itself is wrong? In order to have a long-lasting relationship, day-to-day communication is absolutely necessary and otherwise it will likely fail?
He never initiates communication/scheduling dates. Is he just not into me? Should I see this as a red flag?
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