Not everything that you've lost is worth looking for. Sometimes you lose things because they are not meant to be found, because that is not for you. Not everything that you hold, had is for you. Sometimes they are just borrowed things. They were lend to you, but it doesn't mean you own them.
Don't feel sorry if you did not last. Sometimes it's not worth to fight for a person if she or he doesn't love you. It's the same as you went to a battle alone, and you found out that the one you are fighting for is also the one you are up against. There are some things that you have to let go, because it was only you who were holding to the relationship, and she or he is just waiting to quit. Learn to let go as soon soon as possible, coz it he longer you allow to yourself to stay in that situation, your just accumulating pain and headed for an agonizing torture of a broken heart, or worst a broken soul.