Q1: Possibly a conjunction such as "that'll" for "that will". It's not very fluid but it is acceptable English.

Q2: In 4/4 time, find the 1 and 3 beats and emphasize 1 (the downbeat) mostly, and 3 slightly less. In perfect rhyme line 4 should rhyme with line 2. Perhaps changing "forget" to "forgot" by alternate wording would fit better.

Knowing your storyline and exactly what you are hoping to communicate and at what level of emotional intensity would be very helpful to us.

Does your song have a title yet? That can have a big impact also.

In line 2, "nobody" is three syllables while "no one" (meaning the same) is two syllables and may fit better.

Whoa, I'm sounding like a songwriting student of Professor Pat Pattison.