Being a recent (heartbroken) victim, I have been reading many threads and am amazed how the formula seems to be to blame the one being cheated on, for example not being enthusiastic about sex, dragging up old rows etc etc. It’s happened to me after many years of marriage, which I always thought was a happy one and this appears to be a normal response.
Also what is with this “but you’re my best friend “ toss? When you have utterly devastated, betrayed and destroyed your life partner?