Brother Attempted Suicide

A few months ago my brother attempted to end his life. No one in my family saw it coming and we were obviously upset about it. He has medication he’s taking now and he goes to his counseling meetings. He is like a completely different person! He’s so happy and talks about the future a lot. Which is so wonderful but I am constantly worried he may do it again. My family doesn’t bring it up and it seems sort of like a taboo topic. I still occasionally will cry about it like I just found out what had happened. I don’t tell anyone how I feel because if I do, they reassure me and say that he’s fine now. Is anyone who suffers from depression ever going to be fine? Am I justified in feeling worried about him even though some time has passed? I need advice.