revised and decided that loneliness and one-sided(from defination i) makes more sense together.
we do feel that way sometimes don't we~

I've edited the translation because it did not seem or sound really correct.
Sorry for the late edit though, I only had time to do the kanji and romaji previously before class.

Anyway, the word "botsuri" does not seem to exist,
but "potsuri"(i.standing alone; ii.falling in drops like rain; iii.sighing when saying something) does.
Without the exact lyrics released, I'm changing the "botsuri" to "potsuri" under the 2nd meaning to fit in the lyrics.
correct me if I'm wrong, discuss here if you would.