It's good if he's telling you before he comes, but it's not sounding like a coincidence, is it?

Is he touching it in any way once it's on? Is there oil on him that you're getting on your fingers before you put it on?

He does thrust rather hard and it does look tight at the end.

Maybe I should add some lube. I'll keep a closer eye on him in case he's tightening it when it's on.

Don't let clients put on their own condom.

You put it on, holding the teet so you know it's on properly.

Do not let the man handle his penis at all when the condom is on. 

No matter how awkward it is trying to reach you should have your hand on his cock frequently in any position just to make sure condom is still on. You guide the cock inside, not him.

Then broken condoms can happen, but will be VERY rare.

Use a bit of lube and apply it to the end of his dick once the condom is on - something like liquid silk - NO OIL.

There are some bastards who deliberately break condoms and they are very practised at it.

I never let clients apply the condom themselves and always lube the condom before commencing penetration even if I don't feel that I'm particularly dry.
If he likes to go hard then you need to check the tip frequently and I always check with my hand by guiding them in that the tip is still intact before they enter if they want to change to doggy.