I'm curious, do you think that having multiple other partners meant that whenever you had an emotional thing you wanted to express, it was easier to turn to the "others" to get these needs met rather than turn towards each-other in your marriage?

This is one reason I'm not sure that I want to go back into a polyamorous relationship, because I've found that even in a monogamous relationship if you have deep friendships that you spend a lot of time with (I have a best friend that I spend several hours with twice a week) you need to be mindful of still choosing to turn towards your partner for emotional support. Yes no one person should meet all your needs, but if you completely turn towards others for emotional support it will negatively affect your relationship.