My man, if you really did not want her to leave, come out and say it.
Tell her how you feel, tell her you don't want her to leave you. If you want to be with her, that's the first step you have to take.
I guess he did sort of suggest cancelling her trip, but to give up so easily...
Ah well, I guess they still decided to part ways in the end. I suppose in his own way, wishing for her to forget about him and have a fresh start in Tokyo is also his own form of love and affection for her.