legally you may have to provide evidence of adultery..you merely saying you were adulterous is not usually enough...it would have to be backed up by the person you were adulterous with and put in writing..so make sure they are willing to do that..
Not necessarily...it does depend on where you live but generally if adultery is cited as a cause of action and the respondent admits adultery the court is not obligated to investigate further; there is no requirement for the other third party to admit to it (although it does help). The other third party can simply be known as 'unknown' and no response is needed.
From a spiritual point of view Tij's point is spot on...if he knows you are not being truthful then surely he cannot remarry in good conscience...or is he just concerned with keeping up appearances to the rest of the congregation? Either way do not lower yourself by admitting adultery if you havent actually committed the act. Perhaps when you have moved on and been with someone else it might be an idea to point out that he now has scriptual grounds for divorce but certainly not before.
Sorry to hear that things havent worked out.
DB74