If you don't want any more lies then at some point you also need to let him off the hook and don't put him in a position where he's likely to lie right now.
Yes, he shouldn't do it; yes, it's a problem and a character flaw.
However, why not just keep from making him squirm for a couple or 3 months and see how he grows during that time.
I think often we don't want to do that because, deep down, we're afraid they won't grow, won't change, won't come to those realizations. And they may not.
But in three months, depending on how things go, he may WANT to tell you those things...OR, it may not matter to you then.
If it does still matter, but you've had a good three months, he may feel more comfortable talking about it. He may also come to find that living an open, transparent, and honest life feels much better than lying about anything.
That may not work for you, or may be ignorant on my part, but it seems like it's worth a shot. Still his choice.
You keep using that word. I do not think it means what you think it means. -- Inigo Montoya, 'The Princess Bride'
