We hold on to those who cannot love us for so many reasons.
Sometimes we tend to hold on because we convince ourselves that the circumstance will change... that if we love harder (prove how much we love them), if we give more, and if we stay the situation will evolve. The value of our love will be recognised... it will be chosen.
Sometimes, we hold on because we feel like we have to. We feel like we have to be the ones to fix, the ones to mend the ones to prove that being human don't just give