User blog comment:B214/Don't ask about season 4/@comment-73.46.6.122-20161108220950/@comment-10330822-20161116214111

That scene with Issei getting over Raynare in Season 3 is non-canon. Issei found himself struggling with his emotions as Rias was attempting to get closer to him in Volume 10. Issei himself has always refused to call Rias "Rias", instead he calls her "President", as an unconscious means of keeping his distance. Rias did not know about Issei's problem, because Issei never verbalized it until he was confronted about it in Volume 10. Hence why ocassionally she got so upset, because it feels like Issei only has his guard up around her, and she doesn't understand why Akeno says she is in "first place". In actuality, Issei loves her the most, and that is why he is very guarded around her. In fact, Issei isn't even stated to be in love with any of the other girls until Volume 22, when he confesses to Akeno. It had always been about Rias.

In Volume 10, they make a big deal about the girls confronting him about how he treats Rias, and him finally admitting he hasn't gotten over Raynare's betrayal. They help remove the "curse" from his heart, which allows him to confess to Rias at the end of Volume 10, and call her by her first name.

I don't know how they are going to approach this in the anime, but as far as we know, Rias still doesn't know or understand. Meaning they are still on track for the big confession from Volume 10.

Honestly, the dubbed of the anime has F'd this up even worse, because they don't understand how important it was that Issei doesn't call Rias by her name. They've mistakenly had him call her Rias multiple times, which means that if the anime covers this part, the dubbed is going to have problems.