Well Scarlett, he will be too embarrassed to ever mention it and realise that you were too embarrased to mention it, so I would cease to worry.
It happened to me in a friends flat where I was a guest except I soaked the bedding and stained a mattress. It was a male friend. I was extremely upset and embarrassed, but I had to tell him. I stripped the bed, told him what had happened and he was extremely understanding. That was 40 years ago, and these days blokes are much more understanding.