Totally convinced my man is gay

I would still stick by his side if he is gay. I'd find a way to make it work. We live on separate continents.
If only he would speak, respond, engage or at least just deny everything even if we were both present.

I want to know, can I tell if he has gay sex by the state of his anus? His asshole for lack of a better word. This is very new for me and I'm trying to find a way to deal with it without pushing him away