Know that you are blessed, loved, and cherished. Learn to see and recognize the beauty around you, instead of dwelling in the past and living with regrets and remorse- you did what you could, and there's nothing more left to be done. Forgive yourself. It's okay to lose it sometimes.
It's okay (more than okay) to love wholeheartedly and unselfishly, because it shows you have the capacity to give and care beyond measure, and understand that the ability to love unconditionally is a blessing. Those who do not let themselves, those who are incapable of it, are losing out on a kind of beauty that lights up the entirety of someone's universe. Leave hoping that those you loved with everything you had will remember you fondly. Pray that they find their way, and that you find yours.
Keep telling yourself to let go until you convince yourself to actually do it. Until you wake up one day to realize you really have.
Realize that better things await you, that you cannot hold yourself accountable, and that, as the cliche goes, if something has to be a part of your life, it will find its way to you no matter what. But please understand that some doors are better left closed, because that's the only way you will be able to heal.
Let us forget with generosity those who cannot love us.- Pablo Neruda