I had the same thought as Delphinius. Your partners seem like good people. As such, I'm sure they much prefer that you be with because of want, and not because of need. Like, if you were financially indebted to them, I'm sure they'd rather that you free yourself of that debt and then stay or go because of your genuine desire and love for them, not because you're tied to them. Why should it be different because the need is psychological, rather than monetary? Love and devotion ought to be given freely.
What makes you think that you won't want your partners any more once you're free of needing them? Do you think that being psychologically healthy means you will no longer want love, sex, companionship? Sure doesn't seem to work that way for most people!
Me, 30ish bi female, been doing solo poly for roughly 5 years. Gia, Clay, and Pike, my partners. Davis, ex/friend/"it's complicated." Eric, Gia's husband. Bee, Gia and Eric's toddler.