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First and foremost I would like to tell you that you are not to be blamed for this condition. It is common condition and even if your recent boyfriend finds positive recently, this may have been due to a partner he had before he met you. You are to be congratulated for your honesty in wishing to help your recent ex-boyfriend. At this stage I would suggest you to use barrier methods. you must consider the use of barrier methods (condoms) to prevent further recurrences and infection of your partner.
The current symptom could be an infection caught from your partners before, could be from any of the two boyfriends you have mentioned. Application of cortisone could have masked off most of the symptoms at that time and made your current symptoms appear like a first time infection, however many recurrences also look like first time infections. The hydrocortisone could well have changed the appearances of the sores but it is unlikely that you would have absorbed so much into your blood stream to alter the severity of the systemic symptoms (swollen glands, fever, aches, etc.).
Genital herpes is caused by HSV1 or HSV 2. They typically appear as one or more blisters on or around the genitals, rectum or mouth. The blisters break and leave painful sores that may take two to four weeks to heal. Experiencing these symptoms is sometimes referred to as having an outbreak. The first time someone has an outbreak they may also experience flu-like symptoms such as fever, body aches and swollen glands.
It is advisable for you to start on antiviral medication like acyclovir. This medicine will help to shorten the course of disease and prevent future outbreak as well. But before that make an appointment with genito-urinary clinic in your city. They will examine you, verify the test results and give you the most up to date treatment. Definitely they will keep your details confidential. In addition they have a discrete contact tracing service, they will take care of contacting your partner and offering him assistance, you don't have to converse with him at all.
Hope this helps. Feel free to ask for further help.
Thank you.