Will a cock ring make him last longer?

Hello, so my bf is depressed and not wanting to have sex for a number of reasons. We have been together for almost 3 years. We both are big so not many positions work for us both only missionary, cowgirl, and doggy. And for that he doesn't want to have sex. Also he doesn't last long at all maybe 10 mins at most. Can you tell me if a cock ring might help him last longer???