Wanting is not the answer. No guy wanting would start with a condom and then pops it off.
Guys mind are dumb fawks of society when they are in the heat of the moment. We dont think during sex cuz thinking will ruin things. If he can think of having a few children with you, he will not have sex with the condom on period. IT is a boner killer to think too much when in the heat of the moment. Eff first then think later.
So this is not an accident. He probably wasn't getting the right feeling he wanted with a bag over his diick so in order for him to cum, he's gonna take it off.
I've done it, I've guilty of it but I got lucky.
I also had a few times that it broke too. When it is like a frog's azzhole, it will break and you will hear a pop like popping virgins and then it will be slippery and sliding from here on out.