Do guys only share their finances with girls they see a future with?

I was talking to a good friend of mine and had mentioned that a male friend of mine had spotted me a large sum of cash. I didn't think anything of it at the time. She immediately pointed out that he was obviously interested is something serious with me because men don't usually share their income with anyone.

Is this true? Obviously I understand that he trusts me since he is willing to do so much for me.
Do guys only share their finances with girls they see a future with?
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