After making plans why does he follow up last minute?

I have a guy friend who mentions “we should hang” so i try to make plans ahead for us. I noticed a few times before and now once again, I followed up with him the night before “hey are you okay with this place? And let me know what time you are off work.”
I ask this because i am working as well and need to plan ahead with my schedule. But he tends to reply very last minute past 5pm or around 6pm which is the time most workers start driving and go home.

Why do guys (and i am aware girls as well) act like this? Does he not know I also have a life and a simple “sure” or “sorry lets cancel” doesn’t take that much energy?

After making plans why does he follow up last minute?
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