Infidelity is a hard game and starsky plays some of the hardest here, in that regard...
None of us should ever have our heads in the sand thinking that there CAN'T be an OP...
So bringing that into the air can be VERY helpful for us to intake and deal with in the event that hard evidence presents to us WITHOUT SNOOPING FOR IT!!!
Just have a plan B. Consider it as one possibility and ruminate over how you might deal with it intellectually and emotionally and whether you MIGHT be able to get past it...