You should help your friends with mental illness.
Monica's friend is suffering from depression due to his recent loss of a family member.
Monica wants to react to her friend's depression.
Monica spends more time with her friend and tells him to do more exercise to alleviate the depression.
Monica feels that her friend is annoying and starts to distance from him.
Her friend's depression recovers a lot, and he thanks Monica for supporting him in such difficult time.
Her friend's depression gets worse and finally he commits suicide.