If you love her. You should let her fly. Maims her like this, it's not showing your love, but showing your selfishness instead. If you told her to Fly, i bet the angel will be sad for a moment. But she will realize it, that told her to fly is the healthy way how you show your love to her. Haaa...
It's not sad ending. It's just hang up ending. I bet they will confess to each other by the time the blonde girl go to tokyo. When they distance will wider