Oh Lila, I am sorry to hear that you are also having a difficult pregnancy while he is asking for this. How did it get to the point where he could be so inconsiderate?
From what you said, he might be a bit depressed, too. Whatever is going on between the two of you, there is a whole lot of stress! However, running away to escape and take on a lover, is not the way to handle the enormous responsibilities of a job he hates, a stagnant marriage that needs healing, more tenderness, and more loving kindness, and a pregnancy involving significant health issues. He wants things to change but he thinks polyamory will be a magic wand - start reading the threads here, life will be much harder for him if he has to manage an additional relationship. After all, he can't have that with a make-believe doll, but with a living, breathing human being who has needs, wants, desires, moods, and life goals of her own.
Originally Posted by AnotherConfused
"...I'm worried you don't have time for something like that. Can you prove to me that you do? Start by dating me..."