There were real reasons that you were attracted to somebody originally. The brain doesn't pick willy-nilly. Unless you part ways hating each other for some reason, that mechanism could get triggered again. You can literally fall in love again.
Helen FisherAny kind of novelty or excitement drives up dopamine in the brain, and dopamine is associated with romantic love.
Helen FisherA lot of people have been romantically in love with somebody who they feel wasn't appropriate to marry.
Helen FisherNobody gets out of love alive. You turn into a menace or a pest when you've been rejected.
Helen Fisher