All Sakura is cause Naruto pain.- Okay but All SASUKE DIES is CAUSE SAKURA PAIN. Does that mean that we shouldn't support SS then? I think so. Not to mention, You say that Sakura cause Naruto pain, But where does it show Hinata making him happy? WELL? I'm waiting. and if you WANT to get into filler episodes, go right ahead because that means you have to take ALL filler episodes as canon and therefore I have a VERY NICE FILE of evidence to counter yours in filler episodes. 
THEN there is Boruto to consider. where the two love birds are not as in love as you were hoping
Also Sakura is not causing Naruto pain because she rejected him and friend zoned him, as you all are assuming. Naruto is in pain with Sakura because he feels that he let her down. that is the crux of the POAL. Naruto is assuming because Sakura loves Sasuke he broke his promise to her when he failed to bring Sasuke back. Sakura knows this, whe Sai spelled it out for her.
See, this is the baloney I mean. Sakura can't love Naruto, she causes him nothing but pain. But when she tries to make up for it or shows affection to Naruto it is dismissed as she doesn't mean it or it is "sisterly concern". On top of that you can't come up with and NaruHina moments that are blatantly romantic besides what you MAKE UP.
I know Naruto not being with her kills him inside because he loves her, but as you said, it isn’t just the fact that she isn’t with him, it’s also the fact that her happiness comes first and it kills him that he’s failing to protect the smile that he so badly wants to protect. Also, what Naruto fails to realize is that he is truly the one that keeps Sakura-Chan happy. He doesn’t know that he hurts her as well when he keeps going after Sasuke, because as of 469, she already made the decision who she was going to choose between Naruto and Sasuke, and that was Naruto; if going after Sasuke meant losing Naruto, then she was ready to give up on Sasuke. She might not have understood WHY she was ready to make that choice at the time, but we all know it’s because her affections was already with Naruto, in a much deeper and much more selfless way than she did with Sasuke. And like you and I pointed out, she can’t fake the blushing, the tender look on her face when she was hugging him and blushing again, the anger when Naruto claimed that she was lying, the shy look on her face as she told him
She loved him, and the REASONS she gave for loving him. That’s evidence enough about where Sakura-Chan’s heart lies.
And another thing. They claim that Sakura-Chan would be a terrible woman if she took Naruto away from Hinata. But, the thing that makes that horsekitten is the fact that Hinata herself was willing to accept Naruto and Sakura-Chan being together as long as Naruto was happy, as evidenced by her reaction to Sakura-Chan hugging Naruto. So, even Hinata knows who Naruto would be happy with.
