How do I get my sweetie to let me help him through his major crisis? I just want to give him my unconditional love and support!
Just let him know you're there for him emotionally, but do NOT pester him about it. Males like to go into their mental "man-cave" and think about stuff. We don't like to be bothered when we're in there trying to figure out how to solve the problem.
Show him that you are there for him. Do not try to push him because he might end up resenting you. Give him what he asks for and wait for him to talk his problem over with you.
I agree with kuria. Be there but let him talk to you. There be a time when he will breakdown and talk to you.
Maybe give him a nice card that conveys support and write in it that your available any time he needs to talk. That way your showing you care and the balls in his court. :)
Men do not need the exact same things as women, so don't treat him how you would like to be treated, treat him how he needs to be treated. Ask him what he needs from you to show him love and support.