Boyfriend has blood

So today I put clothes to wash and I noticed my boyfriend has blood stains on his pants. It’s like if a female wore jeans and by the butt there’s blood stains from a period leak. That’s how it looks on his pants! Do guys get periods that I’m just knowing about?!!? when he wore those pants it was on Tuesday I think when we went out for lunch with his family..I was with him the whole time. I was with him all this week actually! The only time he’s away , is when he goes to school and even though, he’s only out for 3 hours the most! And that’s the length of his class and driving back home. I don’t think he’d cheat on me but this is so odd!!!!

I wish I took a picture but I was already putting clothes to wash and I was like whatever but I can’t stop thinking of what it was. Any ideas, thoughts? I’m for sure asking him when he gets home but the stain is gone ugh just hoping he doesn’t act stupid. Ps. It was a lot of blood

I’m so dumb for at least not snapping a picture 😑

Update

It was sauce from the pizza we ate at lunch 🤣🤣.... weird that it got between the legs of his pants. I mean he was half drunk