Some may feel shame at being suicidal. Intense pain is distracting and consuming. It makes those suffering self-centered. It takes away the sense of control. It doesn't mean that they didn't care for or love those suffering because of the loss.
Tunnel vision is part of being suicidal.
Even professionals sometimes have a hard time seeing that someone's suicidal. Misplaced concerns about privacy and confidentiality may deter warnings to others. There are no reliable predictors of suicide. You have suffered the greatest and most horrible emotional shock of your life. You feel betrayed, out of control, disoriented, and hurt.