Hello Alaska Unbound,
Welcome to our forum.
Polyamory is quite a thing to try to get used to; we're not generally taught to think that way as kids (or as adults either, for that matter). Hang in there though, love is an abundant resource. Your wife still loves you as much as ever, she is just finding herself flooding over with that "extra love supply."
Things will probably get easier little by little over time. Being a member on this website will probably help you a lot; you can get a lot of questions answered (and concerns addressed) here.
Hope you enjoy your stay with us.
Love means never having to say, "Put down that meat cleaver!"