Friends, feeling loved is one of the most essential needs of human life. We all need it from the day we were born. Many of us will not realise it, until it is no longer around. Those deprived of it will continue to crave for it for the longest time.
Love is as critical for your mind and body as oxygen is. The more connected you are with love, the healthier you will be emotionally and physically.
I would argue that their deprivation of love is part of the reason why they are showing a lot of anger and aggression in their relationships. It is part of the contributing factors for their controlling behaviour and possessiveness. It is the cause of their fragility and occasional meltdowns that seemingly 'come out of nowhere'.
They did not come out of nowhere.
They came from the roots of their problems of never being able to completely address their long-term wounds and feelings of worthlessness and abandonment.