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Are reasonably sure that there is a tracking app installed on your phone? Of course it is possible, although the person responsible would almost certainly need to have had physical access to it.
Install and run an anti-malware app like Lookout or AVG or avast. Those are all free options available from Google Play. This may or may not identify any tracking apps, but it’s worth a try.
After that, if you feel confident that you are being tracked through your phone, you should consider a factory reset. Make sure that you’ve backed up any data and files that you want to retain. It’s a bit of a pain to reinstall everything, but it beats the alternative.
I also suggest that you change your passwords. If someone has access to your Google account, they can use the dashboard to follow every place you go, assuming you haven’t disabled it in settings. Also, always secure your device with a PIN or lock screen pattern to prevent someone with physical access from installing unwanted applications.