The Queen Victoria model is also available... continue public mourning for the rest of your life.
I knew a couple of old spinsters who had lost their fiancés in WWI and never married. It wasn’t unusual for young women of their time; and it may have been productive for a royal life of Victoria’s time.
I don’t know useful or life affirming it is for most regular people, especially in our time.
Victoria may have publicly mourned Albert lifelong, but she had John Brown in private.