I feel that the problems they have in their relationship are trust and commitment; followed by agreement. I feel that Lady Macbeth may order too much control over her husband, and this leaves things unbalanced. What they should do is attempt to agree with each other and talk things out.  They should examine both sides of their thoughts and situations and come to common ground.

Some steps to help them would be talking things out, listing steps and pointers in any event to hit/talk about. They should also discuss their ideas and judgements, as well as their opinions and look at different sides of any/each situation they get themselves into.