Lyric discussion by Nisshoku 

I don't think this song is about a loose guy having found a new interest. I think the lyrics imply that the guy used to have a relation with another girl. They broke up and in the meantime he met and fell in love with the singer.

However, the previous girlfriend realised how much she misses him and that she can't live without him, leaving him in quite a dilemma.

The singer in this case lets him go, realizing that her 'rival' loves him sincerely and needs him. She lets him go so that he won't have to suffer under a dilemma. Thats how I've always interpreted the song. Its one of my favorites, so pure, noble and beautiful.

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