Were you aware that I will do anything out of spite?
You're lying, right? Why would you do something out of spite?
I'm angry because I didn't like the guy anyway.
You cannot control another person's actions but you can control your reaction. Instead of acting in a negative way, try to talk to the other person and use your words rather than your actions.
I'm going to drink poison even though I know it's a bad idea.
I'm sorry you're so upset, but don't you think that is too extreme? How is everyone going to feel that your spite went too far this time and got you really hurt? I think it's better to work it out with a therapist, because your life is more than this.