I tend to think that you have answered your own question. Of course the risk lies in the exposure to sexually transmitted diseases. Condoms should always be used. If there are no genital herpes lesions present then the risk is not there. Having multiple sex partners increases the tisk of exposure to any STD and then there is the risk of passing it back and forth to sex partners.. You probably should re-think your relationship with your boyfriend, if YOU don't want to take the risk of exposure. I am glad to hear that you are very aware of your situation, and I wish you the best!
Let me know if you would like to talk further.
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I will do some more research and will post back later on. Once you have been exposed to herpes, your body develops the antibodies and you will always test positive even if you never had symptoms. It stays dormant in your body and therefore can appear at any time.