A man can be back at work on Monday, handling the calls, sorting the finances and asking everyone else whether they are alright, while something in him has quietly collapsed. This is often how male grief presents: not as visible sorrow, but as overwork, irritability, isolation, drinking, relentless training, sexual withdrawal or an inability to sit still.
He may not even call it grief. He may call it stress. He may call it a rough patch, a loss of motivation, a midlife crisis, bad sleep, or...