Lesbian Relationship Challenges Support Group
This community is for those who are in a gay marriage, and the unique challenges that may be had in a same-sex relationship. Find support and talk to others in a same-sex marriage, and get advice from the experiences of other members.
I think you may need to do some real soul searching here. Figure out what your needs are. You are not more open minded, or intellectually free if you explore a path that is wrong for you. Being open minded and intellectually free only applies in realizing for some, that path is right for them. Knowing the difference comes from self-awareness and wisdom.
As to how to live with a poly mate. As with any relationship, you set up boundaries. For her, it is going to be that she is free to have sex with whomever she choses. I think that she is telling you, who that person is, is a good sign. As to your needs, your boundaries for her, well, you will have to come up with those. If she can agree to them, then you should feel secure in that poly relationship.
Just two cents worth.