Is it illegal to drop someone off in the middle of nowhere?

If you force someone to be somewhere they don't want to be, and used a ruse to accomplish this, it falls under kidnapping/false imprisonment because you took away a reasonable method of "escape" and you placed that person in danger. If you took someone on a hike out into the woods and left them there to die from animal attack or lack of water you would be guilty, this is the same thing. Get over yourself, your more pissed off because she cheated. Move on. Grow up.