these warts didn't reactivate because you had sex with someone - they were going to show up whether you had sex or not. since you had sex with a known active hpv infection - of course you need to talk to your current partner about this!!
did you and your partner talk about all std's and get tested for them including herpes igg blood testing?
grace
Here's my opinion on your questions.
1) You may have infected him already. He also may have been infected before he met you. Warts are just a nuisance. Maybe you should tell him and give him a chance to decide what to do? Maybe he can get the vaccine if he's under 26?
2) Doctors say 6-24 months. Some doctors say 3-6 months. IMO, 6 months of no warts is probably correct.
3) Anything that lowers your immune system (cigs, booze) can also re-activate the warts. So can un-safe sex. Condoms should have been worn.
4) This is the question we all want to know. If you ask a doctor, they will not give you the answer I have. IMO, a healthier lifestyle can result in less wart re-occurance. Things like: no cigs, no pot, less or no booze, eating healthy, frequent exercise, reduced stress, more rest and sleep, multi-vitamins, daily immune boosting vitamins (C, E, A, Zinc, etc). Doctors will not agree with this. Doctors don't even agree with other doctors!
The CDC claims we are all contagious forever. To heck with the CDC. There are no certainties with this virus. You may get warts 20-30 years from now. Or you may not. You may get additional strains that could cause more warts or you may not. The medical community knows more about it now than they did last year. Who knows what they will know next year?