OK, here is what I'm seeing. There is every possibility she may be mono. That is the way people are groomed in the USA. Don't push her to be poly. Reward her for allowing you your poly lifestyle. Be patient with her as she is trying to adjust.
Thanks for your post. It may help me to deal with some of my own issues.
55 y.o. unmarried straight male w/straight GF wishing to meet women for dating and relationships. Also interested in just meeting people for fun and friendships. Blog and email buddies welcome!