How would you react if you learned your significant other was "tracking" you?

For discussions sake, lets say you’re married or in a long term committed relationship…not one you can just up and leave easily. (living together, financial accounts together…all that jazz)

Would it be the end of your relationship if you learned your spouse was tracking you?
Not with a private detective, but somehow tracking you like GPS or something in your car?
You’ve never given them anything to worry about, never cheated and never lied.
What would your reaction be to this breech of trust?

this is just for curiosity’s sake