There are many things which can be grieved and what connects them all is loss. People will grieve the loss of a job just as much as they will grieve the loss of a person. If it involves a loss, then it also involves grief.
Loss can be grieved in any number of ways. The grief may be express quickly which will also begin the healing process quickly or the grief may take years to be expressed in which case the healing may never come.
Unfortunately, there are many stories where the writer forgets that their character is grieving. When the writer forgets about the character’s loss, the character also forgets about their loss. This means that the character does not deal with their grief.
If grief is not dealt with, it can get worse. Grief can turn into depression or complicated grief which may require professional help.
The most well-known stages of grief are denial, anger, bargaining, depression, and acceptance. These stages can overlap, repeat, or skip; and there is no set timeline nor set order for the stages.