Answers.
1. No, there is no way to tell who gave it to who. That she had a prior infection proves that she had it before you. There is NO clearance. It goes dormant. That is what clearance means. The virus never leaves the body. She has no proof to say you infected her. And if I was her next potential lover, I would let her know that she has a better chance of infecting me than I have of infecting her.
2. Probably but there is no test for men. Esp the high risk strains that don't produce warts. You should assume you have been exposed to it.
3. No one know the answer to that question. Not even God. Average time to become not infectious is 3-24 months. Even if you did become not infectious, you could become infectious again 10-20 years from now.
4. Do not disclose anything. 8 out of 10 sexually active adults have it. She has been diagnosed with it, twice. You have never been diagnosed. Her love life is in the toilet, not yours. She needs to STFU. She needs a reality check here, not you. Disclosure (you slept with a woman who has been diagnosed with it twice) is optional. Most people do not say anything because nearly everyone has it!
5. Yes, time will reduce the chances of being infectious. After 3-24 months, 90% of infected people are not infectious. No one knows who is in this 90% and no one knows what happens next.
Basically, do not worry about something you cannot test for or resolve medically. Safe sex provides 50% protection.