He was jealous because he knew that Albus was a very strong wizard, capable of becoming even stronger than him. And this insecurity he has also plays into his jealousy towards Newt, imo. JD: “I think there's a jealousy with Scamander. He sees Scamander as Dumbledore's protégé – his boy, in a way.
Newt is the reason Grindelwald failed in collecting the obscurus, which he wanted to use as a weapon to reveal the Wizarding World to No-Majs, and Newt ends up capturing him using the Swooping Evil (one of his many magical creatures).
Depp says that Grindelwald is jealous of Newt, in a way: “I think there's a jealousy with Scamander. He sees Scamander as Dumbledore's protégé — his boy, in a way. That in itself is enough for Grindelwald to want to take Scamander down in a way that is ferocious and eternal.”
Maybe Grindelwald just wanted to say something morbid-sounding and clever to Newt on his way out. Maybe he just wanted to get a reaction, because Newt comes off as kind of timid.
Furthermore, during Fantastic Beasts 3, after Grindelwald's attempt to defeat Dumbledore in a duel, the former asks Dumbledore who will love him now that their blood pact is destroyed, confirming that Grindelwald did love him.
Grindelwald used to be best friends with Dumbledore
Grindelwald was expelled from Durmstrang when he was 16 for "twisted experiments," according to the tabloid wizard journalist Rita Skeeter.
Harry Potter creator and coolest Muggle around J.K. Rowling has finally expanded on the relationship between beloved Headmaster of Hogwartz Albus Dumbledore and his former childhood friend – and lover – Gellert Grindelwald.
MACUSA Death Penalty
Earlier in the film, he (as Auror Graves) sentenced Newt and Tina to death after accusing them of setting the Obscurus loose on the city. There was no jury, no trial, just Graves sending them to be executed by some kind of magical fluid.
At the end of "Fantastic Beasts," Newt uses a spell called "revelio" to reveal (get it?) that Percival Graves was really Grindelwald in disguise. Warner Bros.
When Eddie Redmayne mentioned what Newt used to tie up Grindelwald in the context of Newt's specific skill set, he calls it a magical lasso, and says Dumbledore wouldn't have thought to use it.
"I wish you were working with me now. Towards a world where we wizards are free to live openly, and to love freely,"
He's twins in one body. So a gamey eye is more like the other side of him. Sort of like a brain for each eye, an albino twin, and he's somewhere in the middle. Per his interview with Entertainment Weekly, it looks like Johnny Depp has taken his role as Grindelwald quite acutely with this character detail.
Grindelwald called him Tom more than he called him Voldemort if you look again. Even better. That means he was most definitely trying to make a point by calling him Voldemort and wasn't just saying it out of habit.
At the end of The Crimes of Grindelwald, Credence learns through Grindelwald that he is a Dumbledore. The sequel reveals that he is the illegitimate son of Aberforth Dumbledore, Albus's brother.
It turns out that Percival Graves the head American auror (magical law enforcement officer) was actually another wizard, Gellert Grindelwald, in disguise the entire time. Near the end of the movie, Graves, played by Collin Farrell, transforms into Grindelwald, who is played by Johnny Depp.
Credence was sought after by Gellert Grindelwald, who wanted to use his power to kill Albus Dumbledore, who he saw as the greatest threat to his revolutionary cause. While in search of his true identity, Credence heeded Grindelwald's call and joined his army.
And talking about the visit, Voldemort visited Grindelwald only to kill him. Because according to his knowledge, the wand still owed its allegiance to Grindelwald. Firstly, even if we assume that Voldemort knew the whereabouts of the wand, he still needed to kill Grindelwald to "own" it.
He wanted to become the most powerful wizard in the world. He didn't care about Grindelwald, because Dumbledore defeated him, so he was just a weak old man in his eyes. That's why.
Those suspicions were confirmed in 2007 during a reading of Harry Potter and the Half-Blood Prince at Carnegie Hall, where Rowling was asked if Dumbledore ever fell in love, and she replied that she “always thought of Dumbledore as gay”, and even revealed he had been in love with Gellert Grindelwald.
He might still be controlling much of the world if it weren't for his greatest weakness -- his feelings for Dumbledore. Not only is Grindelwald more powerful than Voldemort, but he's also a more compelling villain, which is why audiences will be seeing more of him in Fantastic Beasts 3.
In September of 1927, the Defence Against the Dark Arts professor Albus Dumbledore looked into the mirror and saw his former best friend, Gellert Grindelwald, indicating he still has lingering feelings for him, as well an old memory of himself and Grindelwald in a barn where they made a blood pact; swearing an oath ...
Despite all his evilness, Grindelwald was ultimately a lesser villain in comparison to Lord Voldemort. Unlike Voldemort's self-serving actions motivated by his extreme egomania and pure bigotry, Grindelwald did what he genuinely believed was best for the Wizarding World.
If he had gone to Hogwarts, he would be in Slytherin.
These early followers – for Riddle was their leader, even if he pretended to be their friend – were 'forerunners of the Death Eaters, and indeed some of them became the first Death Eaters after leaving Hogwarts.