experiment on the medicalization of deviance

Suppose two teenagers fall in love, and thus begin making bad (irrational) decisions. For brevity's sake, we'll say they were "in love". Now, as scientists have shown 'love' to be merely a variation in normally functioning brain chemicals (oxytocin, dopamine, norepinephrine, etc), what would be the distinction between treating love as a deviant behavior, and others (eg depression, adhd, obesity, etc.)? If treated, the boy will do better in school, life, etc. How is the distinction to be made?