Hypothetically speaking your boyfriend/girlfriend is sending texts to someone else of a sexual nature (I'm getting in the shower... come on in the door is unlocked. "Oh you're having a bad day? I know how to fix that a good blowjob") would you consider this cheating?
If it is cheating what valued posession of theirs do you break first?
All hypothetical... no way my boyfriend is that dumb *sigh*