Confusion.

The most likely reason we produce emotional tears is because it’s a means of communication.
Before babies can speak, they can cry.
The only way for infants to express frustration, pain, fear, or need is to cry.
Adults may use crying to bond with other humans.
Expressing sadness can prompt comfort and support from peers.
Different languages can provide barriers to spoken communication,
but emotions are universal.
There are also culturally acceptable reasons for crying that bring people together.
Reason being why, I'm still crying myself to sleep sometimes.