I agree with the others above. Do not bring up any R talk unless she broaches the subject first. It will only push her away and back her into a corner. I see absolutely no benefit to you bringing up that you think she has cheated on you in the past (especially if you would want to reconcile anyway).
Same story as Sparkles - my H went from saying I love you but I am not in love with you, but I don't want a D. The more I pushed all of a sudden the only path he saw was D.
Obviously she is confused. Seems like she is asking for time and space, so you have to give it to her. Then, detach, GAL and do your 180's. Hopefully, she will see that you are a man she should never have left.
M 44 H 46 M 20yrs T 25 yrs S15 S12
ILYBINILWY 7/18/15 Move to MBR 9/8/15 Physical Separation 10/10/15 Suspect A 8/2015 Confirm A 12/27/15 D filed by H 2/2/16