HIV1 and HIV2 are different kinds of viruses, but duo combo 4th generation tests are sensitive to both kinds of virus. These tests are accurate 28 days after the exposure. So yours definitely indicate that you don't have HIV. For the next time, use condom and you will never have to worry about HIV. You sexual intercourse exposed you to other STDs not just HIV, so I recommend you to check our STDs forum to get more information.
All the best
"I am from India and HIV 2 is somewhat more prevalent here. "
The statement above is inaccurate. HIV-2 infection is mostly confined to West African countries. As suggested to you by other members, you have tested at the correct time frame for a definitive HIV test result. There is no point in contemplating, HIV 1 /2 or certain other subtypes any more.
You have yourself answered all your questions today, you don't have an HIV concern, you are scared of sex and that's not a normal thing. You need to work with a therapist to get over your fear of having sex, it is a normal human desire suppressing it or abstaining from it to evade from an irrational fear is not going to help you.
You tested 8 times for having sex with a person, that says everything; your assumption that this person was HIV positive is the core of the problem and this assumption took place because of your obsession. You need to fix that.
Once again,you don't have HIV and you don't need to test any further. Good luck.