Echoing the above responses, I would also like to add that while
others may know what that person has gone through, they would never
know what that person have felt. And they, who didn't experience
those things first-handed, tend to simplify the problem and just
shake it off as the person feeling 'emo'. This aggravates the
feeling of <no one (bothers to) understands me>, leading to a
further draw-back syndrome.
To TS response, expressing sadness/sympathy isn't what they
want. From my experience, they just want someone to listen to them
and give them a hug. Hugs are infectious.
If you feel that you can't get through their tough exterior, it
is because they have suffered a great deal and have locked
themselves up. Time and sincerity will shake the spirit.
To leave off,
Love can move snow-covered mountains, exposing the bright
and beautiful sun to the shining valley below, warming a once cold,
heartland
:)