Hiding behind humor?

When a guy hides what he's really feeling behind humor. Like he'll say one thing and laugh about it and then later on come back and say the complete opposite. Or he will make jokes about his fear of commitment or rejection. Or he'll make a joke about how he doesn't want to be a dad because he'd be too good at it, etc. How do you ever know what's real and what's not? How do you trust the things he says or his actions if he's always trying to not show a vulnerable side.
Hiding behind humor?
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