Know about the Girl Who Leapt Through time movie?

I love that movie! Old but gold, watched it in 2014 I guess

That movie broke me.

Same and I kept thinking about it for more than one week. Why couldn’t he just stay back? Why couldn’t he take her with him? I cried... I became her after the movie ended

I think the reason why he chose to leave bec Makoto's time is not his time. If he chose to stay his existence would cease to exist. But that's just me