Topic: keeping secrets

my boyfriend of five years (the father of my kids) gets really angry when i ask him about his finances.  He has a good job and it is legit.  He tells me its none of my f****** business.  I even helped  him get the job.  i don't know how much he makes hourly, yearly, bonuses, on his income tax, vacation pay or anything.  he does pay all the bills and for the most part makes sure that we are fed and have a roof over our heads.  he doesn't buy me things except for holidays and birthdays and i don't ask him.  he knows everything about my finances (unemployed right now) and he knows i don't want his money. to me, he needs it more than me. i think it defines him and its a way of controlling us.  He won't tell me anything.  If he said that he doesn't feel comfortable discussing them with me, then i think i would be a little more understanding.  But when you tell me you love me then tell me it none of my f****** business, somethings not connecting.  I think after five years and four kids it shouldn't be a problem.  So, am i missing something, or is it really none of my business?