Why did this guy suddenly become vulnerable with me online?

I have a guy friend who is special. He admitted to me even that I was special to him. Whether he looks at me as a family, our bond is too tight, he even admitted he loves me and he mentioned in the past I meant so much to him.

He was there for me when a family member of mine died and since then we had been each other's support system whenever we are together in person as he lives long distance. I usually fly to his city.

Whenever I have anxiety, he is one of the topmost I call and I call to share my problems and to calm myself down whenever I have episodes but it so happened he also shared he was depressed so I apologized and he said no need to apologize and that for him it even makes him feel validated and seen. Somehow to have someone who is depress as well helps him.

This guy friend of mine actually rarely shares his problems online as he used to just hide it but I was shock when the day after I called about my problems, he suddenly sent me messages sharing his problems too. He rarely does this if at all. So, now the tables have turned and I'm the one consoling him lol. Why is this guy now being open with his problems? Is he now reaching the brinking point?

It does feel like he's already totally tired because he said he wants to disappear from his family members who are the cause of his problems.

Why did this guy suddenly become vulnerable with me online?
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