People already suck at handling a single relationship so statistically handling more is just significantly more difficult
I guess that’s a fair point. My wife and I were the stable thing in each other’s lives for years before this started. We have a love that can’t be stopped and have navigated more together than most couples ever will. Neither of us would have considered a second partner if we thought it could have weakened our foundational relationship. That is what has freed us to have these experiences.