Sounds like your friend gave you herpes. Go and get a blood test and have them swab the cut while its still raw or open. It might look like a fissure, or even like a little paper cut. He either didn't know he carries it or doesn't care and passes it around since he doesn't see any symptoms. Apparently women get the symptoms more than men, thanks life.
Hello,
This looks like vaginal tear. The lining of the vagina is very similar to the tissue that lines the inside of your mouth. It's soft, squooshy, and it bleeds when it's cut or roughly rubbed. Just take some rest and use sanitary napkins to absorb bleeding.Please do not use aspirin as it will aggravate bleeding.You can use some mild analgesics and antiinflammatories.Till there is complete healing, abstain from intercourse and masturbating. If the bleeding is severe then get it checked from a gynecologist.
It is very difficult to precisely confirm a diagnosis without examination and investigations and the answer is based on the medical information provided. For exact diagnosis, you are requested to consult your doctor. I sincerely hope that helps. Take care and please do keep me posted on how you are doing.