Cheated On And Glad

Went for vacation to her country, where old "friend" of her joyned her (was very deffensive about it, even though I never objected!) He is not on any photos, although it was camera with timeing. After reterning she demanded I shave my bits and insisted on trying different positions, then I seen clear guilt in her. What else then?
I am an European and so take distance to such issues (Would do same in same circumstances!).
This actually cleared much bad air in our relation! My Godmother used to say: "there is nothing like adultery, to vent a marriage". It seems true.