Thanks - and you may want to read a book like Opening Up by Tristan Taorino to help you get acclimated. There are lots of things to think about and/or have conversations around with others who this affects, and that's a good way to head off problems.

One sided polyamory is not unheard of, but yes, you do need to make sure this is truly what she wants. It can be for both of you if it takes pressure off of that part of your relationship and you use that fulfillment on your part to bring other good things to your primary relationship.

I'm not saying this will happen to you, but when Tris Harkness started letting her husband have sex with other people her own libido caught fire again. Interesting reading. Several of her stories are in Sensual, but here's a brief excerpt from one.

"Some stony dam has broken open — some longstanding resentments have been released and washed away in a cleansing torrent. Some inexplicable feelings of being trapped, controlled, pressured, dismissed, disrespected, unloved — so many negatives! — have dwindled down to almost nothing in my long-term marriage. I don’t pretend to understand why, but I know when. It started when I suggested my husband seek sex outside the marriage — with men."

https://medium.com/fourth-wave/unpacking-my-newfound-tenderness-for-my-husband-9a7e905dc193