What to do if my boyfriend doesn't want to tell me why he is depressed?...and what should I do?

it could have alot of mess involveing alot of areas it could be a depression problem as well as anxiety problem it could be things that happened in his past with relationships his family his friends a bad relationship his family could be part of it past experience it could be a mental issue he needs help with a medical problem and if he can't tell you it might be a situation where he doesn't know how hes embarrest to tell you could be a finacial issue could be something happened and he wants to tell you but can't it might be his self esteem thats in the way