I agree with Sandy and in parts with Dipsy.. Ahem till now has not given any reason not to trust him.. He has been honest to Gopi.. Whatever his feelings he had for her. She learned and felt that he was always straightforward with her. What is there not to trust?
Even in this, whether he knows about Gopi knowing his past or not, Ahem is being open by including Gopi in all his talks with anitha.. He has involved her in the plan. There is nothing not to trust.
I think Gopi was not being the ideal wife. She was just being true to her conscious😊