Why the need to explain himself?

I met this guy about a year ago. He asked me out for coffee (we met), to dinner (I went), asked me again to dinner (arranging to go-due to conflicting schedules).

He calls me and texts me frequently and always has to explain himself to me. He picks up the tabs anytime we go out (I have even offered to pay-he refuses).

example: If I ask "How was your weekend" I expect a reply like "Good, or I didn't do much".

Instead he goes into details example: I and Bob went to Las Vegas, we did this and that and came back home that night (blah blah). (never mentions any girls).

What I am confused about is:

Enjoys taking me out, pays for everything (even when I try to pay), calls me, texts me, explains himself to me (even when I don't ask). Has never tried to touch or kiss me, but has sent flirty text and given me gifts (flowers, chocolates, etc).

I assume were just friends (platonic) nothing more, not sure what this guy wants or is thinking?

My question is why all the explaining? do guys just like taking a girl out just because (want nothing from them)? This guy is difficult to read. This guy definitely has me puzzled, whereas other guys I have gone out with I can figure them out or they tell me directly what the intentions are.

By the way this guy is 30 years old (why its odd to me). Mature responses or answers only.