also, when letting him come clean, you need to remember what was past is past. (or is it whats past is passed ?)

if its that these are old lies, and you're just finding out about them now, remember they're old lies.

if they're new lies to cover up new actions, then that carries a different weight.

if he's not telling new lies, then he has learned from the past, and thats a good thing.

"In a ham and eggs breakfast, the hen is involved, but the pig is committed".