This is what one of favorite astrologers Jeremy Neal has to say about this aspect: “Women with Sun conjunct Pluto are often therefore drawn to seek partners who are in some way powerful, mysterious and very often wealthy in their own right. The nature of Pluto though creates a compulsion which very often seeks to test the ideal, mostly because they cannot control it directly. For the Sun Pluto wife therefore, the husband will be subtly and continually tested for weaknesses and flaws to ensure that he is still maintaining the ideal and because Plutonic force is so insidious and compulsive, this process will continue very probably for years with fairly predictable results.” (more)

Constructive focus in a relationship in your chart is made even more difficult through square to Moon. It may be hard for you to hold on emotionally to a position, which is supposed to ease the way to positive outcomes. It also indicates a difficult relationship with your parents and difficulties in overcoming the family myths. There is so much subconscious material stemming from your family and the way you were brought up, that many of those deep issues interfere with your relationships. You need to be completely aware of your concept of personal power, and know what kind of messages you will be sending out. It’s the same with expressing how you care for things and people. If that’s not clear, you can easily be exposed to abuse and disrespect.

Hope this resonates and helps a bit.