What's going on when a boy texts you good morning and good night every day and then suddenly stops texting you one day?

This situation should be analyzed in conjunction with specific scenarios.

If he keeps sending you good morning and good night and you don’t respond positively, then it is very likely that he feels that sending you good morning and good night every day is a meaningless thing. Over time, he will naturally have The day will no longer be posted.

If you have responded positively to him, then if you suddenly stop posting one day, it may be due to some unexpected situation. At this time, you can communicate with him and find out whether he is very busy today, and whether he is busy or not. If you have anything to do, you need to start busy in the morning. If this is indeed the case, then there is no need to worry and this may just be a temporary outage.

But if he is not very busy today and you have been in close communication with each other, this situation may be a precursor to a relationship crisis. Try to carefully recall whether any unresolved unpleasant things happened between the two of you recently, and whether there are any potential factors that caused the relationship between the two to drift apart.