Did I say something wrong? ( Need Advice!!)

Ok so my boyfriend and I been having oral sex lately, as him having past experience with multiple partners, and me not having any ( im a virgin). I told him before things go any further sexually like vaginal sex, I would feel more comfortable if he got tested. I explained to him that I trust him and I know he wouldn't harm me knowingly. but for some reason he got mad and angry? he thinks im being mean and unreasonable? he said hes gonna go get tested but I could tell he was very upset...what should I do so this doesn't cause conflict in our relationship?