'Lifetime' by Usher - Guitar Tutorial

             The Following Progression Repeats Throughout The Whole Song:
 Am  | Em - Em7 |  Gm  |  F

Lyrics:
I can't let nothing come in between the two of us
Cause its' like your all I need since we been together and
Whenever I'm in need of a little love
Its' okay for me to open up but I just can't 
give me heart to anyone
Cause?
Some only call it a life for a season 
and stay a while to give you a reason to put in 
every thing and to think that its forever
But you've given me someone that I can believe in 
I know there will be times we can't 
to an agreement but I know that we'll figure out 
the ups and down
Tell me are you willing to take a chance? Baby if so
Here we go, let me put you in my hand, I wanna be your man
Lets Do it right, so that you'll be with me a lifetime
You know and I know?don't' think that I'm talking crazy, 
your mama and my mama want some 
babies

I used to think that it was hopeless and 
that I should just give it up but I couldn't 
until I found myself a good girl to be in love with
I checked every state and city and looked all around 
the world and I'm proud to say that 
search ends here cause your one in a million to me 
and I can't let you go