There is a distinction between infidelity and unfaithfulness. Infidelity is actual cheating, and unfaithfulness can be viewed that way as well, but it can also be something as simple as wishing you were out of the relationship or that your partner wasn’t your partner. Unfaithfulness can also include becoming guarded from your partner in a way that separates you and dismantles trust. Even beyond the overt interference of fantasizing about being with someone else, this non-physical unfaithfulness dismisses your partner into the background in favor of the possibly instant gratification of, for example, connecting with an ex on Facebook.
Read the full article here: The Secret to a Faithful Relationship (or Getting Out!)