Wow, first, I'm not sure his answer would have been all that helpful in making me feel more secure.

What has been going on for 6 months, your fears of it happening? Do you know what made you think that it was happening? It could be that something triggered some past thoughts, but it could be that he is cheating.

Either way it sounds stressful. I'm glad you're here. Please keep us posted. Do you have a therapist for support in 3D as well as here?