Why did my guy friend become emotional and told me thank you for being there for me?

Lately, my guy friend got emotional and told me "thank you for being there for me even if I'm not the same anymore". He just got surgery and was upset of a lot of limitations.

Whenever he needs comforting, i don't know why but he always goes to me and that is frequently like every 3 days or so. He also updates me of the status of his sickness even if I do not ask sometimes. I did not ask because I got upset of his accident but he still sent me a message asking me to support him allthroughout the surgery and for me to check on him before and after surgery which I did.

I gave much emotional support before and after that I felt exhausted before. What I notice is he's really dependent on me emotionally and since he's attached to me, he seems to have the need to check on me and to send me sometimes some youtube links to help me with my sickness as well.

I don't know how to call it but we are very close but with strong emotional intimacy as we are sweet when sending messages to each other.

So I'm wondering whether him saying thank you for being there matter?

Why did my guy friend become emotional and told me thank you for being there for me?
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