If we want to talk about who is more pitiful here it would be Eclot not Robia, he is an esteemed talented Duke with promising future but reduced to a mere neglected concubine and sent to a war to die, but he never betray the Princess, to be fair the original Princess treat everyone like shit, but still Nadricka and Eclot never lose their loyalty. If Robia can do it once, there is no law that stated he wouldn't do it twice.
If we want to talk about who is more pitiful here it would be Eclot not Robia, he is an esteemed talented Duke with promising future but reduced to a mere neglected concubine and sent to a war to die, but he never betray the Princess, to be fair the original Princess treat everyone like shit, but still Nadricka and Eclot never lose their loyalty. If Robia can do it once, there is no law that stated he wouldn't do it twice.