Recently our 17-year-old daughter introduced her boyfriend to us over dinner. He came with another girl which we initially thought was a common friend. No, that was actually his other girlfriend. Super nice girl, very pretty. That dinner was awkward to say the least. My husband already doesn’t like him due to this whole poly thing. I just don’t understand how our daughter could be okay with this, no matter how good the guy may be.
Listen, I would let it play out. Show her you trust her and love her, but be there for her when inevitably, feelings of strong jealousy or unfairness creep in. That is very difficult to handle for adults, let alone 17yos. More often than not this kind of scenario doesn’t work out. Not to say it’s inevitable, but, it’s not easy to be in one, and it certainly isn’t everyone’s cup of tea. My own jealousy was difficult to face. An emotion which many of us don’t have to fight with often. It’s surprisingly strong. Took me years to work on and even still it affects.