We rather not bother the ones we care for with most of our worries because we tend to believe that we as men would be able to handle them. Sometimes we forget that no man is an island and that we do need emotional support, but it's difficult to ask for it without sounding like a *****.
So when we're seriously overwhelmed with problems, we tend to withdraw inwards rather than reach outwards like what a woman does. I guess it takes time for a girl to realize when to spot the signs that we need reaching out to before we hit the breaking point. Don't just think about yourself, your guy may be handling a severe crisis but doesn't want you to worry. How then is he supposed to shower you with love and attention if other matters are causing him duress?