Well, sounds like poly. Nothing like up-turning ones entire way of thinking to making vulnerability and insecurity be at an all time high at the same time as feeling more on top of ones game than ever before.
Keep breathing my dear and don't leave any stone unturned.
It is likely that this woman will be a very nice metamour one day, as it sounds like she is curious more than anything and loves you to a certain extent. Just roll with it and let it all filter down where it may. When things have settled, and they do settle, you will likely have a more clear path of where you want to go with your relationship life. For now though it seems to be all about trying it all out. Enjoy
Things become all too normal again soon enough.... albeit a different normal.