During the first couple of months of dating, most new couples are obsessed with each other. Once that first blush of romance is over, a more realistic rhythm for the relationship sets in. You say this man is successful. That means he puts time and energy and focus into his work. He can’t do that and be totally available to you. For that matter, you can’t be successful at your work either if you are texting all the time.
It’s not at all unreasonable for adults who have careers and interests to only text or talk to each other once a day or to see each other once a week (as an example). What is unreasonable is not talking about what is reasonable.
You and your guy need to have a clear conversation about where this relationship is going and what you need from each other. What you see as only keeping contact may be making him feel crowded. What he sees as reasonable contact is, quoting you, “driving you insane.” There’s no right number of texts or talks or dates needed to make a relationship work. What is needed is an agreement that is comfortable for both of you.
I wish you well.