Nope you're not alone! Welcome to a vast network of poly people.
It is encouraging to know hung in there through the years of bumps and boo boos to become the happy, loving triad you are today. You will find much moral support here, and good advice, and you will find yourself giving support and good advice as well.
I wish you continuing happiness as you continue to grow together as a poly family.
Love means never having to say, "Put down that meat cleaver!"