OK, so I have this EX who is a police officer. He has tapped into my emails, myspace and cell phone. How is he doing it from another location?? I keep changing my passwords and he keeps finding it out. Is there something that he has done to my computer?? What can I do?
There are many ways for someone to track you via the above methods, now preventing someone from doing this is very difficult. First we will have to determing how it's being done because simply changing passwords or cellphones will not achieve anything.
As he (in this case) is a police officer, he can in the USA (under the patriot act I & II or the FISA act) just ask the ISP for your passwords and get a tap put on your cell without a warrant (thanks again to the above Government acts).
For the Cell point of few, unless your going to spend quite a bit of money and start encrypting your phone calls then theirs not much can be done, apart from getting a new phone and different provider as a very short term measure.
For the Internet, as suggested you may have a keylogger or again he as a police officer is just asking for the new passwords. I personally have all my internet traffic encrypted including the following but not limited to; Browsing,Email,NNTP,VOIP etc, but before going down that line, I suggest looking for the obvious first. Follow the link the others have provided and see if it is a keylogger, if not post back and I'll help you further.