If you both have genital herpes, presumably HSV-2, then you cannot "pass it back and forth".
Once you are infected, you are infected forever- the virus goes into a latent phase in the nerve roots between outbreaks, but you are not clear of the infection- and it certainly is at risk of causing further intermittent outbreaks. Some people get rare outbreaks, some get frequent outbreaks- like even every month. But exposure to your partner will not affect the frequency of such outbreaks.
It may be painful to have sex during an outbreak- but it will not affect the risk of new attacks- since you are already infected.
( Of course I am assuming you both have the same virus- HSV-2 most likely. This is a pretty good assumption if you are sexually active- but a blood test for antibodies can actually confirm that you have the same strain. If by some unlikely chance one of you has only HSV1 and the other only HSV2 , then there would be some risk of transmission- but the likelihood of this situation seems low.)
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