Emotional starvation
I know what that is from personal experience. The emptiness. The loss of someone/something you loved, and the emptiness you feel after that. And the unrequited (one-sided) love is also similar. And of course the absolute lack of love and happiness. I personally experienced all of these things.
Yes, I've felt it my whole life until the birth of my first son. I always faked it with girlfriends and wives, pretty good I might add, I have many still in love with me. I never meant any harm with it I tried to love them it just never fell in love. It's been a lonely life.