Is my partner gay?

I need some help because I’m so unsure. Recently I noticed in my partner of 5 years recent google searches homosexual porn. He’s even asking questions on google about whether his desire to sleep with another man makes him gay? He’s searched stories on how it feels and seems to be really into it. There were heaps and heaps of different gay porn sites, lots of stories he’s read as well. Im too scared to raise these concerns with him he doesn’t know I know

I understand it’s normal to be curious about things like this, but I’m worried he is and our relationship is based off lies? Has anyone else’s partner done this too, advice pls