We call those people sociopaths. You may not even realize who they are because if they are really good at it you'll think any problem in your relationship is your fault.
About one in 25 Americans are sociopaths and being able to manipulate people for their own good is a common trait. So hardly sportingly the higher up the management chain you go the more likely you are to find one.
Here's a handy guide on how to figure out if you're dating one...