Cheating or not
Jev classifies a scenario on a closed scale: not cheating, micro, emotional affair, sexual affair, depends on the couple's deal, or a community or religious rule. Secrecy is scored separately. This is a lab toy. It is not counseling, fiqh, halakha, or canon law. Examples pull from relationship reporting (Schilling / AP on micro-cheating) and from how some communities describe extra boundaries. Pick a case, then Call.
Verdict, secrecy, and typical trust-harm bars land here after Call.