Why do you think Lou Ann and Angel's marriage is in trouble?

Angel had been in an accident that left him with an artificial leg below the knee. The accident had changed him (anger, depression, recovery, suspicion), and Lou Ann believed he didn't even like her anymore. The more they argued, the worse things got. Eventually, Angel began to see himself as less than a man and accused Lou Ann of cheating on him. He became jealous and suspicious, and she simply turned it all off.