Number one sounds like a part of poetry or a song, With you not being here, ........ (ok so what) We need to hear the rest of that, without the rest of the sentence, this is considered just a phrase, it is not a sentence it does not hold any meaning.
Number two: In American spoken language, we say "You better" but we actually mean "You'd better" or "You would better" but we simply say, you better, but the rest of the sentence is not natural.