Cam has caught himself cheating on his wife he tells Allie(his wife) nothing about it. Mia says she loves Cam and Cam says he loves her back. He's been going behind Allie's back everyday stopping to see Mia at the hotel to "make love". Allie had gone off to talk to witnesses for the trial gone three days. Mia stays at Cam's till she returns. All going well tell Cam's mother walks in on Mia and Cam together in the house laying on the ground together messing around. Cam has to come clean to Allie now but he can't find the words to say it.
I think Cam is wrong for not telling Allie and more importantly wrong for even wanting to be with another women.