At what line does shyt cross into where it constitutes cheating?

[Saysumthinfunnymike]

There's a fine line and every woman or whatever gonna look at things differently. Where's the line where it's "cheated"

 

[Shadow King]

There's really none cause I feel like if it's at that point the relationship should end but extended period of emotional/physical detachment, particularly with no communication regarding the individual issues causing the rift and no light on the horizon (willingness to open up) displayed.