How to track someone else's iPhone?

My ex called me the other day and was able to tell me my exact location from the phone call. He lives in another state and has never had access to my iPhone 4S. I changed all my passwords prior to this because he's done this type of thing before. Every time I change my FB password he finds a way to hack back in. I'd like to know HOW exactly he's doing this.

Spy software on your computer? Thats really the only way that he's getting your password, but unless he's posting on your facebook account then he doesn't have it.

Yes cell phones can easily be tracked. May be he knows your cell phone's IMEI number ( International Mobile Equipment Identity). With this code he can easily track you. He can also use some online sites to track you like http://www.delacon.com.au

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