Damien puts Dean on the spot in Friday's Fair City on RTÉ One and the RTÉ Player.
When Damien sees Tommy comforting Mairéad, he thinks there is something going on between his wife and Tommy - still not realising that Mairéad is having an affair with Dean.
Later, Damien questions Dean about Mairéad and Tommy's relationship.
"Is there something going on behind my back?" he asks.
Watch what happens next on Friday on RTÉ One and the RTÉ Player at 7:30pm.
Fair City airs on RTÉ One and the RTÉ Player on Sundays, Tuesdays, Thursdays, and Fridays.
