Losing your temper and playing with small emotions is a way to vent. Generally speaking, people with depression rarely have these behaviors. Because people with depression are generally very sensitive, seemingly easy to get along with, and rarely take the initiative to lose their temper with others, but they can't get along with themselves. They are not good at expressing their inner thoughts and will be inexplicably depressed. If your girlfriend stays alone for a long time without telling you or talking to you, she is likely to suffer from depression.