Would you think your boyfriend cheated on you if he did this?

My boyfriend and I have been together for nearly four years and never had much issues with trust. He just rung me out of the blue and was quite drunk and said ‘Do you love me?” I replied “Yes.” And he said ‘Forever?” And I said “Yes”. And he said ‘Even if I cheated on you?” And then I got sooo weirded out and said No and kept asking why and he just kept the convo going and reckons he hasn’t cheated on me and now we’re fighting but I’m convinced he has now if he had to ask me that, especially whilst drunk and I’m a crying mess and he’s not seeing my point of view, just getting mad at me.