Spoiler Alert ! Nalu Moment !
I know that a lot of people are upset because they didn’t show this scene below in episode 277 but my theory is that Hiro Mashima has his personal reasons for not showing it in episode 277. This scene literally confirms Nalu because Natsu is clearly talking about Lucy in this scene and he is telling Gildarts that he has feelings for Lucy and that he felt guilty for leaving her. This scene also proved that Natsu was missing Lucy just as much as Lucy was missing Natsu. This was a very important scene that confirmed Nalu. Which is why my theory is that Hiro Mashima is saving this scene for next season of Fairy Tail. It’s possible that scene is going to appear in the anime series when Natsu finally wants to tell Lucy how he feelings about her.
Natsu did say that there was something he wanted to do after the war and I am 100 % sure that it has to do with his feelings for Lucy. Hiro Mashima has confirmed in an interview that Natsu dose have feelings for Lucy but he hasn’t said anything because he’s afraid that she’ll reject him and not return his feelings.
Nothing Against Nali but Natsu and Lisanna have drifted apart. As seen in an episode, Natsu had feelings for Lisanna and they were always together but now Natsu spends all his time with Lucy even after Lisanna’s return and Lisanna also told Lucy to take care of Natsu which means that she respects and understands that Natsu sees her as just a friend and that Lucy is the one who he has feelings for. Lisanna basically understands that what they had in the past is over and they’re just friends now.
In this scene it’s hinted that they are talking about Fairy Tail and Igneel but they are clearly talking about a girl which shows how much Natsu has grown to Gildarts which is why this scene is very important because it show that Natsu still has a father figure in his life to give him advice and support.
It’s highly unlikely that they are talking about Igneel, I am sure that Natsu misses Igneel but this scene isn’t really about Igneel. It’s all about Lucy and how Igneel wanted him to live towards the future and show him how much he’s grown as man.
I am sure that Natsu was telling Gildarts that he wants a future with Lucy but like Hiro Mashima said Natsu is afraid to tell Lucy how he feels. TBH it’s not like Natsu has any experience with romance, so it’s normal for him to feel this way, especially when the one he has feelings for is not only his gulid mate but also his best friend and it’s normal for him to be afraid about telling Lucy how he feels because if she doesn’t feel the same it would make things awkward between them and might ruin the strong bond they have as friends.
Nalu has been confirmed to be an official ship so many times in both anime and manga series. So my theory is that this scene will take place in the anime series and mostly likely again the manga series when Natsu wants to tell Lucy how he feels about her. He dose L-O-V-E Lucy but it’s a question to him at least if Lucy feelings the same way.