I wish your story was mandatory reading for every schoolkid everywhere in the world.
When I was a 3rd year medical student I suffered a needlestick injury. For a few months I went through the horror of the worry of HIV infection. I have always said that safe sex is the key. Always use condoms until you are in a super stable relationship. At that point go to your local genitourinary medicine clinic and get both of you checked out. Once you have both been cleared the consider not using condoms.