In actual fact he's the one who is more controlling/jealous (I can't even go to the loo without him knowing!).
Hmmm. It's trite but true that someone who is cheating can also be very insecure/possessive, - either they assume that, if they are being unfaithful, everyone is, or they feel that they are somehow covering their tracks by making a fuss about fidelity.
I don't think we should leap to accusing him of cheating just yet, but TBH, its not looking great for him. It's pretty classic stuff, - you picked up on his odd behaviour, did some digging, found something secret, and then got told the bare minimum to keep you happy, - 'It's only the second time we've met (couldn't say 'first time' due to the use of 'usual place', so went for the next smallest number), nothing to worry about, etc.
If he says 'I didn't tell you because I knew you'd react like this', then that is a MASSIVE red flag, - it is a classic liar's move. It puts the responsibility for the problem firmly on YOUR shoulders rather than his, as if your reaction, not his actions, are the problem. You force him to lie to you. It also implies that you are irrational, jealous and predictable, and that he is forever having to make allowances for your unreasonable behaviour. In fact, other people have noticed it. They wonder how he puts up with you. He must have the patience of a saint. You're so lucky to have him. Stop rocking the boat, or he'll leave and it will all be YOUR FAULT.
Sorry, got a bit carried away there.......