I recently had unprotected sex with my gf we are both 17. He told me he used to shoot up heroin and liquid morphine. We broke up about 6 months ago and I found out he was cheating on me. So I just got tested for HIV at 6 months and it was negative. I made a stupid mistake by being with him but now this girl that I have loved for 3 years is coming to see me, long story but anyways we dated for a while and lost our virginity together and we still love each other. I want to have unprotected sex with him and he knows the situation, so how accurate is the HIV test after 6 months?