Condom Conundrum

Emily • I`m just a girl who has lots of questions and things to say
So my boyfriend and I have been having sex for awhile, and we are NOT trying to have a baby, so we use a condom. The only problem with this is that te takes it off and finishes on my back/stomach... He is scared that the condom will brake inside me if he dosent pull out to finish. So my question/ problem is how do I get him to trust useing a condom more.