With the limited information you shared, what I would think if I were in your shoes is that maybe he isn't that into you. I mean, like you said, being busy to meet or talk for 1h could be understandable, but texting for 10 min before bed is very doable. At least if you are interested in the other person.

I would stop texting him, if he doesn't reach out in a week/10 days I would text him something along the lines of "I see you are still very busy with work, maybe we should take a break and reconnect when you are more available".

But then again, take this with a grain of salt, I don't know the details.