Isn't that even more reason why you should enjoy yourself now? There's already too many tears in the world. You don't need to add more until you really have to.

[He leans over, doing his best to give Hizumi a hug.]

Life's short. You should enjoy it while you can. I'm not saying to forget the future, or not deal with it... but you still have time to be happy. Don't deny yourself that chance.