There is no way to be so certain one or more of dating for sweden past partners didn't have herpes, since so many HSV infections are asymptomatic.
Centers for Disease Control and Prevention:

Genital herpes is an STD caused by two types of viruses.

If you have obvious symptoms of anal herpes, your doctor may decide to treat you after a physical exam.

What Causes Chlamydia?

In cases of severe anal herpes, your doctor may suggest intravenous antiviral therapy.

Treatment for anal herpes helps reduce the length of the outbreak and the intensity.

Be aware that not all herpes sores occur in areas that are covered by a latex condom.

Never disregard the medical advice of your physician or health professional, or delay in seeking such advice, because of something you read on this Site.

Herpes testing.

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If so, you might begin using antiviral medications again when a new outbreak occurs.
