Why guys slow down with texting after a few dates? Is that normal?

before we met up he would text me a few times a day. After first date the text graduately lessen. I would say he had lost interest and sex is all he has in mind. However he took me to 2 groups of friends which makes me think they opposite.

Also he doesn't plan things ahead anymore. I also feel like he is using "man flu" as excuse to go MIA for a few days. He got in touch again and when I told him stuff I'm having trouble with he text me A LOT to provide advice and stuff he reserached for me.

That seems caring but after he help me out he take a day to respond.. He sounds like he is still recovering from man flu, but I think most of the people would be incline to text more cos it cheers them up.

I don't know what to make out of his behavior. Any insight would be appreciated.
Why guys slow down with texting after a few dates? Is that normal?
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