I find it weird that Issa wasn't bothered by this

Issa knows that Tsukune loved Akasha's clone so in a way he loved Akasha inderectly. That should bother him a bit as her a husband. Obviously when Akasha made the Rosary she didn't think that the one who would be able to remove it would fall in love with her clone. I think this part is a bit weird in the story. Tsukune falling in love a woman who is way older than him and a married one at that. I wonder if Issa and Tsukune are discussing this while getting to know each other..Hasn't this crossed anyone's minds?