Yes that's right friend! I agree with you on most points you made. In marriage couples should avoid being secretive that's the only way they can promote transparency. And also you made mention of the fact that if one party suspects the other, the first thing to do is to try and confront the partner and atleast know why and what's wrong. It very true because most times we might just assume or not pay attention to the real problem, so having a proper conversation with the partner can really help a lot most times.

Thank you and best regards