Why does he pretend to be okay?

I know my male friend has had difficult times. I gave him a chance to talk about it. I didn't ask about these difficulties but gave him a chance to open up. He pretended to be okay.

Why did he do this? He has opened up to me before. I have been also having difficult times lately and he has been there for me. So I want also to be there for him.

Can I do anything or should I just leave him alone?
Why does he pretend to be okay?
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