You can't "make" her do anything, and why would you want to anyway? Does it turn you on to think of her with another guy, or do you hope that if she gets another boyfriend first then she'll be ok with you having another girlfriend? What is this about?
The major players. Me, 30ish bi female. Gia, girlfriend of 4+ years. Clay, boyfriend/dom. Davis, ex/friend/"it's complicated." Eddie, roommate & fwb.
The supporting cast. Eric, Gia's husband. Bee, Gia and Eric's toddler. Dexter, Gia's lover. Helen, Eric's lover. Izzy and Nikki, Clay's partners. Liam, Eddie's husband.