One hand claps not without the other

Good friends - so long,
Best friends - so strong.

One though - great one,
Us 2 - become 1.

Great times - never forget,
Looked like - we're set.

Never apart - always together,
Hope to stay - forever and ever.

Times change - move on,
Looks like - love's gone.

OK then - just friends?
Can do - will mend.

But no - awkwardness,
Not friends - we digress.

Worse off - than the start,
Our love - drove us apart