Got this song off an fm radio station, late70s early to mid 80s. I know it is out there, I have no luck finding it. Maybe here...

You're so nice to people, when they're in the same room
But as soon as they leave, you sing a different tune
You tell me lies and rummers baby, behind my back
Do you get satisfaction baby, from all that
Backstabber what you going to do
When everyone catches on to you

I don't want, you around me
I don't need, you near me
I can't stand, people who mess with my life, tonight
Get out of my life... backstabber

Every time I see you talkin' about somebody else
I wish just once, you take a look at yourself
You're 'bout as two faced baby as they come

The band was called Hyts and the song was "Backstabber". You can find the MTV video of it on Youtube.