The five stages - denial, anger, bargaining, depression, and acceptance - are a part of the framework that makes up our learning to live with the one we lost. They are tools to help us frame and identify what we may be feeling. But they are not stops on some linear timeline in grief.
Grief is never something you get over. You don't wake up one morning and say, 'I've conquered that; now I'm moving on.' It's something that walks beside you every day. And if you can learn how to manage it and honour the person that you miss, you can take something that is incredibly sad and have some form of positivity.