The speaker describes a relationship that began with intense closeness but ended in abandonment and hurt. At first, the partner seemed both a lover and a best friend; afterward, the speaker feels empty and struggles to let go. The song moves from longing and blame toward recognizing that the relationship has become harmful and that separation may be necessary.
Several images compare love to addiction. Calling the partner a โfavorite drugโ suggests a powerful attraction that is hard to resist, while โrehabโ represents the difficult process of recovering and breaking the emotional attachment. The partner is also called a โdisease,โ turning the usual idea of love as healing upside down: here, closeness feels damaging. โWean myself off of youโ similarly uses the language of reducing a drug gradually to describe detaching from someone.
The speaker is not simply saying that love itself is bad. The lyrics suggest that unequal devotion and repeated hurt have made this particular bond feel compulsive. The line about the partner โusingโ the speaker differently hints at mismatched expectations or intentions, though it does not explain exactly what happened. The speaker blames the partner, but also reflects on having let them in and on wishful thinking, showing both anger and some self-questioning.