Hey so I tried buttsex and I need advice

I tried taking it up the butt (total virgin to man on man but I thought fuck it) and I made the dude put a condom on. We didn't really get anywhere because it hurt so much but he was really eager and he touched the tip of my rectum with his dick I think before putting the condom on. I don't think he actually entered me without it but shit I couldn't tell being bent over.Advice on possible STI risk please as I heard he's a bit of a slut? So let's assume he has HIV and Ghonnaria and Chymidia for arguments sake (he claims he's clean but I've heard he's a real grindr warrior). Oh and he sucked my cock too (I only jerked him off)