I seriously doubt that his waist lesions have anything whatsoever to do with your herpes and I also have to say I doubt it is shingles. Does it cross an imaginary line down the middle of his body? It sounds to me like a bacterial infection. Were any cultures done? The cultures would say what bacteria it was, if it was a bacteria, and what antibiotics it would respond to. Or were viral cultures done to determine if it was actually herpes zoster virus (the cause of shingles)?
However, if indeed your culture was positive for HSV 2 (remember that HSV 1 can also cause genital herpes), then he is vulnerable to your HSV 2 infection. Taking daily antiviral medicine reduces the risk of transmission by almost 50%. And it can be taken once per day. I think this is something you should discuss with your health care provider.
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Terri