I can't stop thinking of my ex, and how he's in therapy because of me.
Why do you think he's in therapy because of you?
Because of mean things I have said to him
You don't know for sure if that's all he is in therapy for. Some people go to therapy to maintain their mental health.
Everyone in my life is crazy except me.
Often times when it seems like everyone else is being crazy, you may be the one who needs some help. It would be good to talk through this with a mental health professional, who can give you a better perspective on what you're going through.