Why is letting go a part of loving someone?

Now it varies from person to person about what he means by letting go. If you are in relation then it has different meaning whereas if you have broke that relationship, it is need to be understood with different context.

In relation- While in relationship you need to let go of past mistakes of your partner, forgive him/her for not understanding your view, for not meeting your expectations certain times and your numerous assumptions that have been developed through bitter experiences you had with your partner. Of course there is limit to everything, and I am not asking anyone to tolerate abusive or violent behavior. But sometimes the facts are not real, you may misjudge a person through his/her behavior, but if you have spent enough time with that person, you’ll get to know what intentions he/she has for you. Because behavior can change at some point but a person’s intentions remain same. Let go of the all the hatred in your heart and try to give a fresh start. There is no denying the fact that it becomes hard to let go some things. It needs continuous practice and just remember you are doing it for your peace of mind. It is for the betterment of relationship. 

Have realistic expectations from your partner. Don’t expect anyone to be in same mood every time. There would be times when things would get bitter and all you need to have is some patience. Never underestimate anyone giving you some time as it is won’t come back. Remember that when you love someone, you must accept them as they are. Because everyone has some flaws and if you are touched by anyone’s looks, give it sometime to fully know that person from inside. 

Post break-up- On the other hand, if your partner has broke up with you. It takes more time to let go many things. The reason behind that is every person has different story. Some are cheated and for others, things didn’t go as expected. Its not necessary that the reason for breakup is betrayal. Lack of communication, poor understanding, disrespect and disapproval from family could be the possible reasons. So, it normally takes more time to let go of things when you both shared a very special and strong bond. When break up happens due to outside forces, it becomes more than hard to let go of memories as you were mutually not ready to give up. When a person gets in habit of sharing everything with other person, it takes a bit more time to accept and embrace the life.

What I believe in this context is that Everything is meant to happen the way it is planned. You cannot force anything in your life. The more desperate you want someone to be with you, the more suffering it will cause. So let go for yourself, for your betterment and believe that everything happens for your highest good. I know its easy said than done, but, don’t wait for someone else to come and play cameo in your life and make you feel good. Take 100% responsibility of your thoughts, actions and reactions. Its your life and you are the in charge of your happiness. Don't condition your mind and depend on anyone for  your happiness. Life is much more beautiful and worth than what you think it would have been if things were as you planned. Things take time, but eventually you get over it when you follow a healthy routine and realize there is much more to life than what you used to think.

Let go of what was and embrace what is now.