It is very hard to see someone you love struggle with cognitive behavior issues. When you see them have a hard time with things that used to be normal for them, it can break your heart.
My sister is taking medication and undergoing treatment for cognitive behavioral therapy for depression.
If this is something you have never struggled with, it is hard to understand what they are going through. Some people think it is just a matter of snapping out of it and getting on with life.
There are many complex issues that are much more involved than that. I think the cognitive therapy sessions are as helpful for her as anything.
It gives her the chance to express herself and realize she has help and people who understand what she is going through.