What is the life expectancy for a 44yr old man who has developed cardiomyopathy?

Cardiomyopathy . It depends on the type of cardiomyopathy, mostly it is related to the ejection fraction or the ability of the heart to pump blood. If the heart is failing and not able to pump blood then the risk of dying is higher.
Uncertain. In any individual the prognosis is variable. There are so many different reasons for cardiomyopathy - familial, ischemic, viral, hypertensive, hypertrophic, stress induced, and secondary to valvular heart disease that prognosticating in any individual is impossible. This is best done with the treating cardiologist who knows the particulars of the individual.