Boyfriend accused me of cheating. I didn’t.

I really just need to get this off my chest and get this out. My boyfriend accused me right away of cheating when he said he saw something strange in his urine. He’s only seen it the one time. We went through a whole thing and i got tested that night for safety purposes and just in case he hasn’t seen anything since. I let him go through my messages because I have nothing to hide. i flat out asked him if he was projecting. I don’t believe he was. I think he just freaked the f out.

I’m just shaken he accused me so easily and im not sure how to say that to him. We’re ok now and he says he believes me but I really need an apology.