Compersion is not an issue for me. Earlier in life it may have been, but at this stage whatever pleases my spouse is fine with me. But then again, I'm more easily the poly one in the house! My mono wife was unaware of the word and it's meaning til I recently gave her info on it. A book is also on the way to her, too!
To strictly trained, society molded monogomists, tight control over one's spouse is very ingrained. My wife has always given me the freedom in our life together, to make decisions, undertake challenges, travel extensively and live freely, within the confines of our marriage (monogomy), knowing she was completely secure in her place. Going poly however, has really challenged her. I am hopeful that as we discuss the topic of compersion (living with my other love in this "V" with her secure) that she will be able to experience this 3 way love in the same way, that she has with other topics at other times in our marriage. She really wants me to be happy. I want to be happy. Our 3rd loves seeing both of us happy and we complete her life. It should be a "win-win-win" for everybody. I hope so.