You can't hold someone when he/she is willing to leave and its bitter reality of life. No matter how many one sided efforts you are adding into your relationship when both partners are not equally willing relationship never survive longer.
Life is beautiful when you find partner who is willing to be with you in your both good and bad times but the life can be worst when that same partner have no longer any interest in you and tasks you did.
There is a believe that never ever run behind a person who is not in love with you instead love the person who loves you if you want to live satisfied life.
Even if you get the person whom you love or desire but if they are not willing to stop they never will and until then you lost everything your time, effort and trust on love.
Love is not bad thing but humans are you can't trust everyone as your life partner they are special ones who love you and will say that they will never leave you no matter how many circumstances get worst.