infidelity [infidelities](unfaithfulness in marriage or other moral obligation) noun [UK: ˌɪn.fɪ.ˈde.lɪ.ti] [US: ˌɪn.fə.ˈde.lə.ti]She never forgave him the infidelity and held it over him every chance that she got. = Ella nunca perdonó su infidelidad y se lo recordó en cada oportunidad.
unfaithfulness(characteristic of being unfaithful) noun [UK: ˌʌn.ˈfeɪθ.fəl.nəs] [US: ˌʌn.ˈfeɪθ.fəl.nəs]