While everyone has a degree of privacy in a healthy relationship, people that are together usually do have a habit of saying certain things to each other - like for example where the other person is. You don't have to call each other all the time and give reports, but if you notice that your partner is always secretive about his or her whereabouts, that could be a red flag and a sign that your relationship is becoming unhealthy.
You need to maintain a certain degree of transparency for a relationship to work. This might be a sad fact for some people, but the fact of the matter is that people lose a certain degree of freedom and autonomy when they are in a relationship - this is just how things work.