How should I handle MLC direct lying?

[beingreal]

I know or am 99% sure this is a lie, that he's going to do something he's hiding, I'm to smile and say "have a great time"? No confrontation or questions?

This is hard. I've been able to do it but have depression/resentment after.

Yes. This is exactly what you say. It's even better if he's volunteered the info & you've not asked what he is doing. He can't argue much with that statement, especially if you mean it.

I'm still new to this as well, but I've decided to treat H as though he were just a stranger in a grocery store I'm having a conversation with. I wouldn't question the guy beside me in the line at the deli when he told me he was picking up potato salad to go to a friend's BBQ & watch the big game.

I'm treating him like I'd treat a stranger. Think about it, we're more often kinder & more respectful to strangers than we are to those close to us anyway.