Who Told Men Not To Cry?

The first time I saw my dad cry was during his younger brother's burial and I knew he was truly broken. For me it was a sign that he was balanced and wasn't even shy that lots of people were in attendance or that he "was not supposed" to cry. I felt safe seeing him express his grief and he is 73 now.
So after I cried last night for missing a gentleman who has coached me for 9 years, I wondered this morning if a man would have reacted same way I did, if he loves so one so much and was gonna miss the person always. (Not in death)

So i thought, quite unlikely.

Funny summation!

Who told you (men) that a man shouldn't cry?

Women? Other men? Both men and women? or Society including children?

Your honest answer will be appreciated.