My brother created a Ponzi scheme and is in debt by 100,000

I don’t know what to do. I am 27M, my brother is 31M. I just found out that my brother created a Ponzi scheme thinking he could pay everyone back, but his business failed and he is now in debt by 100,000. I am his confidant about everything, but he told me I had to keep this a secret. I don’t know what to do, I don’t know what will happen if he gets reported to the authorities.<br><br>What should I do? I am taking my time to think but I am his only confidant and I don’t want to betray his secret.