Never loved other than him.

Marcus seeing how Lucian isn't saying anything, and it's not like Lucian to just keep quiet, he concludes that this is going on pretty well, so he presses on.

"Ever since you married Anna, all she has ever done is weep and complain because you have never spared her even the slightest attention, not even on your mating night! We both know how a mating night can be really tough without your given mate! But In fact, you were violent toward her that night! And then you disappeared. Where were you that night? Were you not with Aiden?! You abandoned your own mate for that boy!" Marcus presses on, his voice dripping with accusation, though in truth, he is only speculating.

He doesn't know for certain where Lucian was that night, but Lucian does. And the fact that Marcus is hitting so close to the truth unsettles him.

He can't help to think that Marcus was following him that night too.