One interpretation is that the two persons became each others' lovers knowing that they were both attached to other persons. They decided to pursue a relationship on the side, then the woman decided to change the rules of the game. Now she threatens to tell the man's spouse about their illicit relationship as a way to blackmail him into giving her more money. So he's not hurt because she doesn't love him. He's hurt because she wants to blackmail him into giving her more money for keeping his cheating a secret.
What I don't get however, is why he is bringing love into it. There was no love in the beginning and there is no love at the end. It seems maybe he started catching feelings for her along the way and now he's upset that she didn't catch the same train to 'pointless land'.
Anyways, have a listen to the song, after all, Dexta Daps, controversial as he may be, is one of Jamaica's hottest dancehall artistes at the moment. The translated lyrics are provided below.
WARNING: It contains explicit language.