Can somebody be deeply in love and not show it?

My dad was friends with a married couple along with their children and children's husband and the couple never showed affection for each other or talked about each other in public. At her husband's funeral, the wife looked so miserable people were worried she would die from depression over the death of her husband. I was not at the funeral but my parents were and they actually started crying when I asked them how the husband's wife was doing at the husband's death. They said she was doing absolutely horrifically terrible.

Can somebody be deeply in love and not show it?
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