And then he is given a book on how to astral travel. He learns how to separate from his body and project to his girlfriend's place. There he learns the truth of his betrayal.
Infuriated at what he discovers he becomes obsessed with the need for revenge.
He spends many months learning how to manipulate physical matter through the astral dimension until, finally, the day comes when he is ready to use what he has learned.
Maybe he shouldn't have allowed his obsession to control his senses to the degree that it did. There was something he had forgotten. Something that could bring his quest for revenge to a conclusion more horrible than even he could have imagined in his worst nightmare!