Unless he specifically asked you input for his problems, don't bother digging into it. You could ask surface level, but if he doesn't go deeper, don't pry. Women instinct is to talk it out, men instinct is to solve.

What he needs is the time and space to think.

You can give him that space.

Not in the sense of leaving him alone. But in the sense of taking care of him so that he can focus 110% on his problem.