Can’t get Condom on!!!!

Er

My boyfriend is uncircumcised and we are having A LOT OF TROUBLE getting the condom on. We’ll pull down his foreskin, and roll on the condom, but it physically won’t go any farther than half way down the shaft. This is very very frustrating and has caused tension between us. It’s gotten to the point where I don’t even want to try to have sex with him anymore because if the condom doesn’t work he becomes agitated and despondent. Last time this happened we tried 3 times and after he wouldn’t talk to me for three hours. What do we do?