He sometimes doesn't text me back until the next day or 2 days later im starting to feel invalidated?

Anonymous
4 year relationship. Very busy with his business but a text takes 2 seconds.
Example today he text me that he was super busy with work can we hang out tomorrow night instead. I texted yes
Then I texted him some stock info and I called him for a quick hello.
I have not heard back it's been 6 hours.

This is common texting phone communication from him.
Last week same thing. 2 days of no response. Then when I get mad he gets all oh darling I'm sorry.
I don't know but I'm feeling like I'm not important enough to him or something and I almost feel like breaking up.
Updates
+1 y
Maybe I'm too needy but something feels off with this. Like disrespectful or something.
Or maybe I just don't understand the level of anxiety he has with his business.
He sometimes doesn't text me back until the next day or 2 days later im starting to feel invalidated?
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