What does it mean if a man is vulnerable with a woman?

What does it say about their relationship if a man is vulnerable with a woman he doesn't know very well. For example, admitting he'd been going through a tough time recently.

Does sharing something like that suggest that he feels close to her or has feelings for her? Do guys usually share these things, or only with someone who is special to them?

What does it mean if a man is vulnerable with a woman?
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