Don't be always available for everyone that the other person gets the power to dominate your happiness; make you feel worthless and make your emotions a puppet in his strings
NEVER ever sacrifice your happiness , suppress your pains to keep the other person contended. Just don't listen ..say ... tell them about your likes and dislikesDON'T FALL FOR OR FEEL SYMPATHY FOR DAMAGED SOULS
that's not at all selfish ; that's self love . People who are already there in you life ought to be understood in hard times but a person who is broken suddenly enters your life don't give space to them and if u wanna do .. Don't ever be emotionally attached or dependent on them(even if once you have been in a similar situation) because they are very unstable and can leave you in a flash . when you try to understand them make them feel wanted that person will burden you so much and damage you even more than before
Hence understanding everyone ; giving space and time to all toxic people ; being available for everyone though seems beautiful in all those fictions where one love a broken heart to get all happiness is far from reality because such people suck and deteriorate you emotionally.