No offence to Lisa, but Zak seems to have had nothing but grief off her since his breakdown! If it’s like this much longer, it’s still wrong, but that probably leads to his affair with Joanie!
She's been through a lot with the Dingles since she married him. Zak would take off for months at a time not contacting his family, he didn't share his feelings about nearly killing Cain and he lied about his cancer reoccurring. His family's anxieties surrounding his behavior were just as real as his illness. Then he uses work as an excuse to run away from his marital issues. Everyone has their breaking point but Lisa is expected to remain strong for the family and be there for everyone else despite what she is dealing with emotionally.