Is my partner gay?

Firstly I’m not against him if he’s gay I love him but I don’t want to waste my life with someone who could never truly reciprocate these feelings.

Recently I’ve noticed in my partners google searches that he’s been doing a lot of searching on homosexual porn. Also googling about his desire to be f**ked really hard in the ass? Reading other people’s stories about it. I understand a lot of people are just curious but this seems to be really playing on his mind? We don’t use lube when we have sex & recently I found a bottle of it hidden in his drawer. I’m so confused

He’s never given me any other reason to believe, I’m too scared to mention anything incase is upsets him. I don’t know how to gently approach the subject as he has no idea I even know what he was searching. He’s also very protective over me when another guy even messages me or speaks to me? I don’t get it.