Relationship Advice, I NEED HELP!!! 😔

My boyfriend and I have been together for about 4 months. We haven't had many fights only a few, other than that we have been as happy as can be, never been happier before. Recently he has had issues with his family life and when we are together he is completely silent, distant, and rather not tell me whats wrong. Instead he keeps it bottled up and I cannot get him to open up. I feel like our relationship will fall apart because his distance to me means that he's not willing to let me help in any way i can. I fee like im in the dark with his life and it sucks because we used to tell each other everything. what do i do? should i leave him alone and let him realize how it's affecting our relationship or should i just keep trying to get him to open up?? I need help!!!