How is the relationship between Lady Macbeth and Macbeth presented at the start of the play?

Lady Macbeth and Macbeth are presented in an interesting manner at the beginning of the play.  It is clear that they have a very passionate relationship and that Lady Macbeth is seductive in the way that she speaks with Macbeth.  Moreover, she is very much interested in supporting Macbeth's ambition and search for power throughout the beginning of the play. When Lady Macbeth reads the letter detailing the witches' prophecy she is excited about what he has been promised and vows to make this dream a reality.  However, this relationship, while it seems loving and possibly even supportive at first is truly a dysfunctional relationship at heart.  As Lady Macbeth attempts to persuade Macbeth to act on the prophecy in order to ensure the outcome he desires, it becomes clear that Lady Macbeth is extremely controlling and manipulating.  As Lady Macbeth pushes Macbeth to complete the murder it becomes evident that it is not Macbeth's best interests that she has in mind but her own advancement in position that she seeks to gain.  Moreover, as Macbeth begins to unravel and lose control it is clear that he no longer consults or includes Lady Macbeth in his plans.  This dysfunction carries through to the final scenes of the play when Macbeth barely pauses a moment to mourn Lady Macbeth's illness and eventual suicide.