Saffie,
This is powerful and written well.

Pondering love again.
Such a complex emotion -
Such an over-used pacifier.
^^
A very strong opening stanza. Yes love is over used and very complex. This gives an insight as to what the poem is about 'love'

Why say the word
If you don't feel it in your heart?
^^
I often wonder this myself because any a time and many a person will be hurt just by the simple word love.

Don't try to comfort me
With a lie that will only break me.
^^
This is very powerful and has a deep meaning because many people will lie about being in love when infact they are not.

I will not be satisfied
Just because the words escape your lips,
And your coldly spoken promises
Insist it is the truth.
^^
Another truthful and powerful stanza as it happens plenty times. Cold words spoken a plenty just to satisfy 'the one.' The words you use here fit nicely into the piece.

Love is such a complex thing
But it is also very simple,
^^
Yes love is complex but it can be made simple by people if only they told he truth and didn't say they loved others when they didn't. I like how you use words from your title here to link it in.

For if you truly love someone
You can feel it in your heart.
And if that person loves you back,
You wouldn't have to wait for them
To prove to you its true,
For If they truly loved you,
You'd still feel it in your heart
^^
This stanza sums up the whole poem and makes a statement about the whole title of why love can be simplified.

Job well done. Take care.

Em