Welcome to our forum.
I just posted on your other thread, so you can check that out. Sometimes I think polyamory is just a simple matter of having faith that you can love two (or more) people at the same time. Have faith in yourself; you have two very good relationships in your life, and you do your own part to make each of those relationships great.
Hope this helps, and I hope you enjoy your time on our site.
Love means never having to say, "Put down that meat cleaver!"