Give her the space... don't ask where she's been. DON'T SNOOP. I know it's hard. I've been there. I found an affair a couple years ago. It ate me alive. I lived and breathed finding more evidence and proof.
I have a new situation now. There may be an affair, so I just assume there is. Confirming the affair wouldn't change much other than my own attitude and emotions.
M34 W35 S5 S2 T10 M6 on/off over the years including her A Recently- Nov 2015 bomb Nov 2015-Feb 2016 Reconciling Feb bomb March-April Reconciling May - bomb Mid-May I tell her I'm done