Grief is the normal and natural response to any major change that happens in our life. When grief is caused by a sudden and unexpected death, then those who are left behind are often filled with an enormous amount of unfinished and incomplete business in that emotional relationship.
When I spoke with some young people about climate change, they said that they "really worry about their futures and living on a hotter planet due to the increased greenhouse emissions and global warming." They feel hopeless and scared about their futures, and that stress and worry is taking it's toll on their mental health.
Those important days and events are very powerful reminders that someone special is missing from your life. Valentine's Day like birthdays, anniversaries, and holidays, can be one of those days that stir up so much emotional pain for you.