Thank you very much you are the best!
If your ex had abnormal cells and no warts, she probably had high risk HPV which dosen't cause genital warts, it causes cell changes in the cervix. There are no tests for men to see if they have high risk HPV.
1) Doctors advise if you have been symptom free for 3 months you can assume you have cleared of the virus, some say 6 months. Though there is a risk of the virus becoming active again. 90% become clear after 2 years.
2) That is true.
3) Some have stubborn cases of HPV which mean they are contagious for many years. Although the majority clear the virus after 2 years and therefor stop passing the virus on.