Not necessarily. You could be with an abusive jerk and just miss the stimulation (drama), or just miss not being alone. None of these situations are indicative of love.
On the other hand, you may have feelings for someone that you didn't know about, until you found yourself missing their company.
On the other hand, you may have feelings for someone that you didn't know about, until you found yourself missing their company.
Not necessarily, but it could be. It could just be you miss the familiarity. If you were together for a long time, it will take time to move on.