In order for love to be understood as an emotional interdependence, there must be clear limits set on the boundaries of what does and does not constitute love. There must be a clear definition on the overarching bundle that ties these emotions together.
For example, if we detest someone and then see that a mishap has befallen them and feel joy in that moment, there is clearly a form of emotional interdependence that exists between the two of us. It is reasonable to assume that this extends beyond the simple sadness/joy relationship. Maybe we also feel sad when this person is succeeding. This is clearly a complex emotional interdependence but is not love.
Conversely, if a happily married individual enters a spate of clinical depression and no longer feels emotional concern to their spouse, are they no longer in love?