If you caught your gf/bf/spouse "cheating" on you online (talking to someone else and planning get togethers and stuff like that). would you consider it cheating?
EDIT: to clarify, option 3 means, that they talk online, then they get together, so only once they get together/meet.
EDIT: to clarify, option 3 means, that they talk online, then they get together, so only once they get together/meet.