Consider it Chekov's relationship. I and a wide range of my social circle also participate in open or poly relationships, and we've all chosen to do so for a reason. While some people migrate back and forth from being monogamous and poly, trust me when I say it will definitely come up again. I really hope it works out for you, you sound hopeful, but definitely be able to have that conversation, and retain the ability to do what is best for yourself, while respecting their lifestyle choices as well. I'm not trying to be preachy, apologies if it comes off like that, but I have seen relationships advance with this dynamic, and it's a tricky thing to manage properly for all involved,It's sort of immaterial at the moment, because she's not seeing anybody else.