What's That Thing?

What's that thing seems so strange yet so familiar?
What's that thing makes me so dissatisfied?
Just a little bit of pain that leaves me bruised and addicted
Just a little bit of heartache makes me feel so alive
Just a buzzing in the brain that leaves me lost and conflicted
Twisted up inside
It's mostly love
It's mostly love
It's kind of an affliction
That no one knows a definition of
That fits like a glove
It's partly give and take
But it's mostly love
What's that thing gets me addled and bewildered?
What's that thing keeps me scattered and confused?
It's a chemical reaction so unsafe, so unstable
An irresistible attraction and I come all unglued
Try to balance on a wire but I tumble and fall from this
Dizzy altitude
It's mostly love
It's mostly love
It's kind of a commotion
That I could see me getting tired of
If push comes to shove
It's partly a mistake
But it's mostly love
Could it really be a thrill beyond description?
Or is it only like a disappointing kiss?
Anybody with a heart would feel as partly pleased as this
What's that thing so annoyingly elusive?
What's that thing that just can't be specified?
It's a sentimental fling that finds me flustered and clueless
I don't really want to trust it though it seems bona fide
Is it ever gonna feel like I am tall enough for this
Roller coaster ride?
It's mostly love
It's mostly love
It's more or less uncertain
It's somehow sort of reminiscent of
None of the above
It's sometimes slightly fake
But it's mostly love
It's partly give and take
But it's mostly love
It's partly a mistake
But it's mostly love