Eve has called this kind of time the "dark night of the soul" moment. Unless you are truly exceptional, you will experience it at some point, usually early on. Maybe your partners are struggling. Maybe you're tired of fighting your inner demons. And this is when it really matters whether you've committed, with all your heart and soul, to being poly. If you don't commit, if you aren't ready for that dark night of the soul, and you back away in fear when it comes, then you and people you love are going to get very hurt.