HIV is never cleared by the body, HPV is often cleared within 24 months.
I am not sure about India but in Europe and USA, magnetic couples live happily as they use the required precautions. Technology of sperm washing also help them to have infection free babies.
Marrying a person is purely a personal decision based on emotional attachment. Answers to your questions are,
1. No, it is not possible. HIV can not be eradicated from the body, as of now.
2. There is no way to "clear" the virus, known to mankind today.
3. This is a personal decision.
4. No, it is not if you take proper precautions of safe sex.