Of course we don't know here but it would sound like your H is having an affair. Password on the phone is a giveaway. Since you've already confronted it, to me it would seem him being vocal about what he is up to each day, how long it took to get home etc are just ridiculous attempts to make everything seem normal. Have you noticed him pulling away, withdrawing, not arguing with you recently? Is there any way you could get some intel on your H? Perhaps phone records, emails?
My W made up an extra shift at work. She searched the house for a particular pair of knickers. She asked for a lot of money to buy a work colleague a gift for giving her a lift. I ended up following her. She didn't go where she was meant to go. I rang her workplace later on. She wasn't there. I confronted her during the night. She came home and asked for divorce.
I think the most crucial things there are the last two sentences. Think carefully about how you're going to confront your H once you have confirmed his A.
I recommend you do some reading to make sure you get this right. Since your H has already asked for D, getting this wrong could provoke him into action. Get it right!
BD - 30TH JAN 2015 S - 30TH JAN 2015 PA CONFIRMED - 16TH FEB 2015 (SINCE AT LEAST OCT 2014) CONTINUAL TALK OF D ME: 31 W: 28 T: 10yrs M: 4.5yrs D:5, S:6