What does the expression “Where you’ve been happy, don’t come back” mean?

This expression suggests that if you have been in a place or situation in the past that made you happy, it may be best to leave it in the past and not return to it. It can be interpreted as a warning against trying to recreate a past experience or state of happiness, as it can be difficult to replicate the same feelings and it could lead to disappointment. It could also be interpreted as a reminder to focus on creating new experiences and memories, rather than trying to cling to the past. This expression could be used to encourage someone to move on from a past situation and look towards the future.