Hello and welcome to the forum.
First, I suspect you are referring to genital herpes?
Regardless, the advice that your boyfriend received from his physician seems quite unsubstantiated. HSV-1 and HSV-2 are both very common infections worldwide and estimates suggest that at least 50 million people have genital herpes in the United States alone. Many couples continue to enjoy a healthy sexual relationship even when one has genital herpes but condoms and other precautions should be used.
As far as his cardiomyopathy is concerned, I do not see any significant risk. Even when HSV involves the body outside of the genital region it rarely if ever involves the heart. As far as infections in general are concerned, it is true that people with severe heart failure can have an exacerbation of the heart failure triggered by an infection. However, you describe a “mild cardiomyopathy” and your boyfriend is much more likely to become ill from the common cold, flu, etc, which by virtue of being in contact with anyone during the winter (including you) would put him at some (very small) risk. As a heart failure expert, I see no reason why you should not be able to continue to be in a relationship with your boyfriend on the basis of the information you have provided me.
Hope that helps.
Best,
Dr. Rich
Thank you so very much for your view on this matter Dr. Rich! Much appreciated.