The Madonna-wh*re complex... HELP

So my addicts boyfriends therapist has just said he has this exact complex called the Madonna-wh*re complex- it actually makes complete sense to our situation. Has anyone experienced this or can elaborate on it?

Basically due to his addiction and the way his mind is wired- he sees me as like the perfect girlfriend for him, someone he wants to be with forever, loves and has that emotional connection with but can’t link the sexual feelings to me as he doesn’t an easy girl that turns him on for his quick fix and then he forgets about :( He is unable to link emotion to sex and the more he falls in love with someone the less sexually appealing they are to him!