Suggest Treatment For Anxiety Related To Unwanted Pregnancy

Hi, My boyfriend and J are together for 4 years, but for the last 1,5year, he refuse having real sex with me. We have always had sex with condom, causd he is afraid of me getting pregnant. Once.. the condom broke, nothing happened.,but from that moment he wants everything else, and his sexual desire is same, everything is ok, but when it comes to real sex, he would always say- no, we can do it in other ways, because if we haue sex he thinks about it 24/7 , and cant help himsef wondering if everythimg is alright, and J cant convince him, that it is and that J wont get pregnant..How can J help him?