Is what my dad said true that you can’t show a man that you’re very in love with him?

I feel like some of the advice that my dad gives me isn’t true because he did used to be a player in his earlier years. Today I was talking to him how I felt bad seeing my boyfriend sick the way he was on Friday and that I actually cried in front of him and he told me “no don’t do that you can’t show a man that you’re so in love with him.” I don’t really believe this because if you can’t be vulnerable with your partner then who could you be vulnerable with? But is there any truth to what he said?
Is what my dad said true that you can’t show a man that you’re very in love with him?
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