<human>: Can you succinctly summarize the text in 1-3 sentences?

A few months ago I moved out of my old apartment so my girlfriend and I could get a place together on our own. I didn't know where I was moving to when we filled out our move-out paperwork, so we used my old roommate Bob's parent's address as our forwarding address since they still lived in town. I changed my forwarding address when I moved in, but I didn't hear anything back from our landlord about our deposit.

Fast forward to last weekend, I was hanging out with Bob and asked if his parents had our deposit yet, since legally we should have heard something by now. Bob's girlfriend immediately got sketchy and asked to speak with one of our mutual friends in another room. Bob casually said he hadn't heard anything about it. I asked him to ask his parents again, and told him I'd contact our landlord if they didn't have anything.

Well his girlfriend's behavior was a major red flag, so today I called my old landlord and apparently they didn't have my forwarding address so they were sitting on my half of the deposit. They wouldn't tell me if they had sent out his half, but it was strongly implied they did.

So why would he lie to me? I think it can only be for a few reasons:

* He thought he received the whole deposit, and intended to keep it all.

* We're only getting about half of the whole deposit back, so he didn't do his half of the cleaning/repairs (I moved out a few days earlier) and he intended to hide that from me.

I don't know for sure if he has his check, but between his girlfriend acting sketchy and the landlord actually having his forwarding address, I'm mostly certain he got it. 

I really want to know for certain before I tell him to go fuck himself and I'm pretty certain he'll lie more if I just ask him, so should I bluff and say I know more? Should I just tell him I talked to the landlord and see if he comes clean on his own? Should I just drop the whole thing since I'm getting my deposit back?
<bot>: I suspect my former roommate of lying about our deposit to me for months. I'm mostly certain, but I don't know how to find out for sure.