You are not responsible for the happiness of others. Even the people you love. Sometimes, no matter what you do, sadness is unavoidable. But please remember that is not your fault. You can't love someone's pain away, but you can love them through it. You cannot stop them from hurting, but you can be there to hold them when hurt settles in. Being there with them and doing everything you can is sometimes all you can do, but that is more than enough in every way. I know you want to be the hero of their story, but the hero of their story is them, whether they realize it or not. Do not think any less of yourself because you can't save them. But be so damn proud of yourself you are there to help them save themselves.
Share this to anyone you believe need to be blessed for their action even in hardships. Friendship is what comfort and holds us together.