My ex-boyfriend has hacked into my facebook over 5 times. How do I prevent this from happening?

[Old Fat Bald Guy]

He has probably installed a keylogger or other backdoor trojan onto your computer, perhaps did while you were still with him.

Now the keylogger is telling him everything your computer is doing and what you're typing, and he can just mine that data for your usernames and passwords.

If you charge him criminally with illegal computer trespass, you can really ruin his life. The authorities will confiscate every computer he owns, and he will legally barred from using the internet for some period of time, a year or more.