I don't like that people confuse committed with monogamous. Monogamy is a form of committing. You are committing to only be with one person. I am wholly committed to my wife. Anything she needs, I want to be there for her. I am committing my time and energy to her. My love. Devotion. Everything. That isn't the same as agreeing to be monogamous.
Read the ethical slut. Then have your significant other read it. It's not about more or less. It's about differences. You love a because of one thing and b because of another. You aren't going to leave a for b or vice versa but you may leave a and stay with b and vice versa. It's not a pool of love that you divvy out until you're dry. It's a wealth that gets larger the more people you can share it with.
"Regret for the things we did can be tempered by time; it is the regret for the things we did not do that is inconsolable." - Sydney Smith
Kyle: 27 year old male
Katie (rymmare): 25 year old female
Kids: girl: 5 years old, boy: 3 years old