I'm not crazy about lying, and if you think he might catch you in it, I wouldn't do it. However, it has been my observation that the hint of you going to an attorney might set him off - it often seems to. They suddenly feel like 'all right then, I WILL file, and this will get dirty". That's why I would keep it completely under the radar if you could.
Ironically, my brother - who has 3 failed marriages because he's always looking for the other person to make him feel better - did something like that when he left his last wife. He had evidently been stewing over leaving for a while (W didn't know a thing - I think there was an EA he was having at work). Anyway - he saw attorney's number W had in kitchen and jumped to conclusion she was calling a divorce attorney (actually, she was calling about my brother adopting her daughter). Major projection, obviously, on his part, but I'll always wonder if those few hours or days of thinking the wrong thing weren't the final push that got him to do something about leaving - and once he found out the truth, he'd already set his course.
