Why would my guy friend not reply to my touching birthday greeting?

A week prior my guy friend was already acting funny and was messaging me being very worried about a lot of things related to financial matters. He was forced now to work part time as well and began to reply late and he apologized saying he was busy working full time and part time.

I get that he was busy but i know him so well that i know he seems depressed although he didn't say anything to me. So, although i was not feeling it and was slightly hurt he really replies late, I still gave him a long message thanking him and letting him know i'm always here for him and that these things may have happened to him but I consoled him and told him that the Lord has better plans for him. I even told him sweet things like thanks for being a blessing etc. but he has yet to respond.

I have a rough idea that he is going through something but I thought my message will cheer him up. I swear my message I anticipate would touch him and make him cry but I guess not?

He is an emotional person and very caring towards me so this is odd that he is not responding even to say thanks.

Why would my guy friend not reply to my touching birthday greeting?
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