MAKING OTHERS FEEL THAT YOU'RE OKAY about a certain happening is NEVER AN EASY THING TO DO. They don't know how that person CONVINCED HIMSELF/HERSELF EMOTIONALLY to be just fine in front of them, to be PHYSICALLY FINE. Laughing, smiling, talking so much AS IF NOTHING HAPPENED, AS IF IT DOESN'T HURT. You never know how he/she is OVER-THINKING about the possible things that would happen, the POSITIVE/BRIGHTER and NEGATIVE/DARKER SIDE of it, the CONSEQUENCES.
But despite that, YOU SHOULD ALSO UNDERSTAND that, that person DOESN'T WANT TO HURT ANYONE, especially the person(s) he/she is REALLY IN TO, the person(s) who made him/her FEEL SPECIAL, a ONE OF A KIND. That's why YOU SHOULD UNDERSTAND why he/she is PRETENDING TO BE PERFECTLY FINE.
What can you DO TO COMFORT him/her?
To be this someone who''ll be his/her crying shoulder? To be this someone who'll be inspiring him/her with words? To be this someone who'll he/she can count and lean on? To be this someone who'll be his/her best listener? To be this someone who'll bravely confront him/her what you feel towards the situation? To be this someone who'll be hugging him/her until you wanted to? To be this someone who'll really show your affection? To be this someone who'll be talking to him/her until he/she says what he/she really feels? To be this someone who'll give him/her space until the time he/she is ready to talk about it? To be this someone who'll ask a common friend/close friend of yours how you're doing? IT'S UP TO YOU.
You don't know how much that person would APPRECIATE THE EFFORT YOU DID JUST TO MAKE HIM/HER FEEL AT EASE, EVEN THOUGH YOU THOUGHT IT WAS IN A MEAN WAY. That would NEVER MATTER because he/she has already RECORDED EVERYTHING IN HIS/HER HEART and MIND, the thought of making him/her FEEL THAT YOU'LL ALWAYS BE THERE FOR HIM/HER IS ENOUGH. :)