Scared af

So back in march, the guy I was seeing off and on (FWB situation) had a badly infected ingrown hair on the base of his penis, and unbeknownst to me, the blister broke during sex and he bled on me (possibly getting inside of me) I found out later when I saw the bloody condom in the toilet when I went to clean up, I definitely had blood on my vaginal area, anyway, he said not to worry as he'd been tested recently and was clean. Well now it's December and I find out he's been fucking around with other chicks (we were exclusive, or so he told me) so I'm like how the hell do I know if you were actually clean or not? 😡 I don't have a gyno and have crap insurance so I don't even know how to go about getting tested for EVERYTHING, and honestly, I'm really scared because it's been so long since it happened. Help.