Bf cheating or am I paranoid

EDIT** yeah we do have issues around trust due to past situations. No actual cheating. But trust was broken in ways close to it

My partner has a yeast infection and is insisting he got it from me. But I don’t have one. And the only time I’ve ever had one is when I was on antibiotics years ago.

I read online guys can just get them. But it is very very uncommon.

He didn’t know you could just get them as guys. And he firstly mentioned he didn’t sleep with anyone else.

But that comment kinda made me suspicious. Like if it was so obvious you didn’t why bring it up?

Idk maybe I’m being paranoid