Gregor has a good point. Dealing with WT shit is hard enough, but to throw adultery in the mix just fucks everything up, to put it bluntly.
Nothing you don't know already but try to to seperate the two main issues as you go forward: 1) the marriage and 2) the religion
It's hard because to JWs they're intertwined. A zealous JW is married to the WT organization as much as they are to their physical mate - a spiritual menage a trois, if you will.
How ironic - you can get DFd for messing around but the zealous JW is expected to have two partners - their legal mate and then the WTS.