@Millionairesshortbreadshort
Thanks HelloFrosty
Curious about your DH was doing! 
Well, one example was - we bought a PS3 back in the noughties, and a few months after, they brought out one with a much bigger hard drive. DH said he took the first one that we bought 6 months before, slammed it on the counter at the GAME store, and demanded they give him the new/better one. They cowered and handed him the new one. (Apparently.)
A month or so later, I found a receipt in the dining room drawer whilst looking for my passport, and it had a part exchange transaction on it. GAME were letting people take their old PS3, and hand over with £125 for the new one. So he had part exchanged it, and not got another (new) one at all. Just wanted to big himself up.
Also, he has fibbed about other bits of stuff he has bought like he said he got something on Amazon that cost £15, and when I saw the box in the trash I saw it had an Argos reference number on it, and was actually £30. (I fib about how much I spend too sometimes. Not MEGA thing, just 'oh yeah this was £10 when it was £15.) No idea why. Don't know why he does either.
I have also caught him out hiding stuff, like a few things he doesn't want me to use (in case I break or lose them,) when he has told me he's lost them. And he told me he'd run out of sleeping tablets one time when I needed one - as he didn't want me to have one, I guess as he only had 4 left. I saw them at the back of the bathroom cabinet the day before though, so I knew he was lying. But as I said, I do the same, keep stuff to myself occasionally. We are all entitled! We are autonomous human beings, and as a few people have said, we are not joined at the hip.
Stuff like that.
I am as bad as him tbf, and as I said, I have taken time off and not told him. Oh, I also pop and see our adult DC on a lunchtime some weeks, because I just want to see them alone. I don't tell him as he would feel 'left out.' I have to tell them NOT to tell him. They think it's mad, but they know what he is like.
I mean God forbid I see my children on my own WITHOUT HIM! 
Do it @Millionairesshortbreadshort book the time off. Fuck what others think!