Grief is an enormously complicated emotional state that cannot be pithily summed up like that sentence. It's just a quote from a game.
In my experience, it doesn't pass, as in disappear. Instead, the fact of the loss slowly becomes a new fact of your reality. The newness of it will pass. The rawness of the pain will fade - most of the time. There will always be things that bring the person right back sitting next to you. But you begin to re-make your life.
If you continue to struggle and haven't already done so, I can recommend talking with a counselor (I hate the word therapist). Sometimes we just need to unload, but don't want to unload on/burden the other people in our life. Grief can be isolating in this way.
In my experience, it doesn't pass, as in disappear. Instead, the fact of the loss slowly becomes a new fact of your reality. The newness of it will pass. The rawness of the pain will fade - most of the time. There will always be things that bring the person right back sitting next to you. But you begin to re-make your life.
If you continue to struggle and haven't already done so, I can recommend talking with a counselor (I hate the word therapist). Sometimes we just need to unload, but don't want to unload on/burden the other people in our life. Grief can be isolating in this way.