Why does he want to text me everyday?

I have a guy friend who says Im one of his favourite people to talk to and he sees us as a "friendship". He gets upset when I dont message him after a day. We talk daily.

He messaged me today and asked if I was ok because he hadn't heard from me in a day. I had work and was tired etc. He got worried he upset me. I reassured him he didn't.

He also wants me to go to him if I am ever upset and gets upset if I do not.

What does this mean?
Why does he want to text me everyday?
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