My personal trainer boyfriend flirts with his clients. What do I do?

My boyfriend trains a lot of women in their 30s, often stay at home moms. He will sometimes flirt innocently with them to make them feel better about themselves, keep them as clients, or other reasons which I don't know. He says there is nothing wrong with it, and I have nothing to worry about. He has a flirty personality and probably doesn't even count it as flirting. How do I get over it? I've talked about it with him so much, and he always says I have nothng to worry about, and it doesn't mean anyhting, its just the nature of the job.
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Also, just another thing, it isn't all his clients he flirts with, just some of them. So is this still considered part of his selling tactics?
My personal trainer boyfriend flirts with his clients. What do I do?
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