Why don’t guys tell girls what’s on their mind?

So I decided to video call my boyfriend and I was explaining about my thoughts and emotions. Then I asked him “what are you thinking about?” And he replied “nothing.” And I asked him “what’s on your mind?” And he said “oh my god, I’m not thinking of anything. I’m looking at you!”
Why don’t guys tell girls what’s on their mind?
Why don’t guys tell girls what’s on their mind?
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