My partner cheated on me. How do I file for a same-sex divorce?
The same way you would file for regular divorce. File for the petition for disillusion of marriage, get your partner served with for them to answer within the 20 day period. Now, the actual fact of cheating usually has no bearing on the divorce itself unless there was some dissipation of assets or that third party has been around the children. That is something you need to discuss with your attorney.