I do not think that cheating in the past or anything like that matters. It seems to me that he might be facing criminal charges for the first time in his life and is therefore lost. Nothing in relation to you. You did not ruin anything - he deposited client's money in his account, not you.

I think that when he said he had a lot on his mind, he alluded to his being lost in this new situation with potential criminal charges.

His priority is probably getting an attorney now.