I totally second what Boring Guy said. Like him, I am living with one of my partners, but totally in love with my other one. They complement each other, and I've got plenty of affection to go around for both. My gf also loves my bf as a friend, and considers him part of our family. He's also in a long term marriage (25+ years), and has always had gfs, and it's not a threat to his marriage. In fact, since his gfs meet needs his wife doesn't, I believe it actually strengthens his marriage to have others in his life, so he doesn't have to cheat, or leave her, to get sex and other things his wife doesnt provide to his needs.
Love withers under constraint; its very essence is liberty. It is compatible neither with envy, jealousy or fear. It is there most pure, perfect and unlimited when its votaries live in confidence, equality and unreserve. -- Shelley
Mags (poly, F, 60) loving miss pixi (poly, F, 38) since January 2009, living together since 2013
also loving Punk (monogamish, 42, M) since Oct 2015
"Master," (mono, 34), miss pixi's Dom for 2 years