I think you can love someone without having made a lifelong commitment to them. When I was younger, I had a close friend- my best friend- and I loved him more than anything. We were together in every way possible. Except for the commitment factor. Because we hadn't worked our lives out yet. He left- and he never came back. It was okay. It didn't mean we didn't love each other- just that we weren't ready to be married at that time. I sort of see Dart and Kimo the same way. They are essentially friends.