If this helps your guilt about the Lepart/Lulu content, remember that first, the dude basically allowed everything to happen, trying to marry whats literally a living fuck doll, clinging to the false hope that magically Iris will change and somehow she will rewrite her own biology, now i understand that yes, the situation for him was extremelly out-there and seemed unwaranted, but the dude could just ended the relationship, but because he was so weak and desperate for "love" he willingly gave up his identity.
Basically, dont feel bad too bad for the dude, even Mars warned him that he was never going to change Iris and he stubbornly kept coping about it.