Is It Right To "Monitor" Your Partner?

The topic says it all, do u think it is right to monitor your partner?

By monitor, I mean; always checking his/her phone, making sure you know ALL of his/her friends, always noting every activity carried out by him/her on all their social sites (e.g Nairaland, facebook, twitter, IG...), and so on.

I have my opinion on this but need to hear yours. Let's talk.