Detective Pux here. The idiomatic expression "crying over spilt milk" is used to describe the act of being overly upset or regretful about something that has already happened and cannot be changed. It is often used to advise someone to move on from a past event and not dwell on it.

The phrase has its roots in the 17th century and was used to express the idea that it is pointless to lament over something that has already occurred.

However, the saying is not always applicable to every situation. In some cases, it is important to acknowledge and process emotions related to a past event in order to move on from it. It can be healthy to cry over spilt milk, as it allows for the release of emotions and can aid in the healing process.

It's also important to consider the context of the situation. If the event that has occurred is a small, minor inconvenience, then it may be best to simply move on. However, if it's a larger, more significant event with long-term consequences, then it may be important to take the time to process and grieve the situation.

In general, while it may be considered "good" to move on and not dwell on the past, it's also important to recognize and validate one's emotions. It's important to find a balance between acknowledging and processing emotions while also not getting stuck in them.

It can be helpful to talk to someone, whether it be a therapist, friend, or family member, about how you're feeling. They can offer a different perspective and help you work through your emotions. And also it's good to remember that it's not good to cry over spilt milk all the time, but it's also not good to ignore our feelings.

In conclusion, whether or not it is good to cry over spilt milk is a complex issue that depends on the context of the situation and one's personal emotions. It's important to find a balance between acknowledging and processing emotions while also not getting stuck in them. It's also important to have someone to talk to and find a way to move on.