Got period blood on my bf’s boxers plz help

I’m on my period but my bf asked if we could have sex- I told him there was blood but he said it was okay. Later I was laying in bed and he was in the restroom and he called me over to lmk that there was blood on the inside of his boxers from putting his boxers on after lol. I was embarrassed and I offered to wash it, but he just said he’d throw it out. I’m on my period and extra overthinking so I’m just extra embarrassed on why he called me over to show me if he intended to throw it out anyways. 😭 I’m embarrassed , did he just want to show me or what’s going on