"I'm not in love with my partner anymore," may be the most common complaint. Being in love is an experience that is proposed as mysterious, ineffable, mystical or even ecstatic.
The flood of phenylethylamine in the brain can be a very pleasant experience, but it is not viable or recommended as a solvent criterion to guide one's affective and loving life. The addictiveness of this brain neurotransmitter explains why many people pretend to maintain a relationship in order to be permanently under the physiological effects of this powerful substance.