Is keeping my cats indoor cruel?

I met someone online who lives in Bristol, England. We corresponded many times and we both have cats. However, he doesn't believe in keeping his cats strictly indoor because cats are happier if allowed to go outside. I don't agree with this at all because I don't want anything bad to happen to my cats... show more I met someone online who lives in Bristol, England. We corresponded many times and we both have cats. However, he doesn't believe in keeping his cats strictly indoor because cats are happier if allowed to go outside. I don't agree with this at all because I don't want anything bad to happen to my cats and that is why they are never allowed outside. I feel really bad sometimes about this and especially when he tells me that his cats are having so much fun being in the outdoor and mine are just imprisoned. :(
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