Don't dwell on the past, just know that the "I'm done's" and the "I dont love you anymore's" are emotional WALLS...

You ARE in there still, but she is putting up a front. SHe does NOT want you tapping into that and bringing those feelings to the surface.. She's buried them deep and puts up a wall of "I'm done" to shut you out and drive you away...

The best way to combat the wall is two pronged :

a. Expose the affair
b. Repair your 50% of the marriage as best you can wtihout interacting wtih her at all...