She never asked for help? So you didn't give her the attention she was after? Oh dear! You must be feeling so much guilt and remorse! Take care, she made a choice and you were not responsible for it. Everyone has regrets but they exist because we make mistakes and that is the nature of hindsight. We can never learn without making mistakes. Perhaps you can be more sensitive to those who care about you and you care about back, in your life at the moment, and let them know you love them and are there for them. Maybe you had too many problems of your own to be there for her, maybe it was someone else's mistake to not see she was having difficulties. Maybe it was someone else's mistake.