I'm trying to find different ways to force my ex to get help
Is there a big enough problem that you'd have to force your ex to get help?
Yes, I think he's a psycho and the best way to help him is to kick his ass out.
If you feel you are in danger then call the police. It is not safe if you think your ex is being a psycho.
I can't prove that psycho. I just want to show him that I don't care about him anymore.
If you think your ex is dangerous then report them and move on. The more time you spend around them the better chance you have being in danger. You should let professionals handle people who are mentally unstable.