One mans perspective,
A man could be having a good day. Feels good and be on an up. But then something in their head could flip that switch and then he goes flat in mood and emotions. This is not because someone has upset or angered then , it is an emotional reaction to daily life and that they don’t deserve having a good day.
Then your emotions will make it had to get out of the dark emotional state you are in. This is when some people turn to alcohol or drugs to numb that feeling.
Some people recognise that they are feeling low but find ways to bring themselves out of this state. Some find it difficult to ask or get help and will not want help.
Be kind and never judge if someone is not presenting as them self, just be there for them.
Motivational things 