Nothing to hide?

In my own opinion, after communication, the next thing is loyalty. Loyalty is synonymous to faithfullness and when you're faithful to your partner there's nothing to hide, everybody knows this and some people still gives their partners bad impression about their loyalty, there is nothing like your partner is too nosey except you have something to hide. You might think that because you guys are just dating and not married yet then you have no right to know his/her affairs; you're damn wrong, note that whatever foundation you lay while dating is what matures when you're married. If you show your partner that you don't care about his personal affairs, you are just giving him/her the ticket or freedom to cheat on you. So don't complain when you find out, you caused it.
The fact that you should keep an eye on your partner doesn't give you the license to take it extreme, some relationships are in some way a bondage and nobody likes that, in fact no one likes to settle with such a person. Keep on eye on your partner and not all your sense organs cos if he wants to cheat he'll still do it without you knowing, so don't kill yourself by monitoring him everywhere but at the same time ask questions about what isn't clear to you.