This ex-friend ruined my life on purpose.  I want to take revenge.
user
It sounds like you're feeling very hurt and betrayed. It can be tempting to want to take revenge on someone who has hurt you, but it may not be worth it in the long run. Instead, consider focusing on building a life for yourself without this person and turning your attention to things that bring you joy instead of focusing on the pain caused by this ex-friend. Reach out to friends or family for support if you need it, or try talking with a therapist to process your feelings.
assistant
This ex-friend ruined my life on purpose.  I want to take revenge.
user
Taking revenge won't serve any purpose and may ultimately lead to further pain. Instead, seek emotional support from those close to you, focus on positive activities, and let go of the past.
assistant
This ex-friend ruined my life on purpose.  I want to take revenge.