My response is more non-traditional. I had a gay partner of 6 years in the 80's. We had a home together. We eventually split up because we were both young and were moving in different directions. His name was Angel, for reference.
I met my current hubby almost 10 years later, but I still kept in touch with Angel. In fact, hubs and I used to get together with him and his new partner. I never stopped loving Angel but I knew we would never be a couple again. He came to my father's funeral 12 years after we'd split up. That's love. So, yes, I guess it's possible to love two people under certain circumstances.
Along these lines, I would imagine there a quite a few straight "exes" who still love each other but have moved on with other spouses.