deliberately, intentionally constructed are more satisfying, and more likely to lead to happiness, than relationships whose shape is determined by default social expectations. It is absolutely possible for a monogamous relationship to be built by careful, deliberate choice. Many people are content in monogamous relationships, and that's fine. Monogamy doesn't necessarily mean simply following a social norm. If you decide that polyamory is not a good fit for your life, that's okay. Don't do it or let anyone push you into it.