>

Her boyfriend didn't cheat. He was drugged and raped , and then Dani condemned him to death. 
He couldn't consent to the number of people that see the ending of midsommar as a girl boss moment or a good one is kinda disturbing. 
Dani has been taken advantage of and is now stuck in the middle of nowhere with a sucide cult. It isn't a good ending.
Edit: I'm an idiot misread what you were meaning
I don't remember ever watching a movie as thoroughly predictable as Midsommar.  Every scene of the movie felt like I had written it myself, it was just that "expected" >

The plot is painted on the inside of the church, they show you the plot in the movie unless this is /s >

"everyone treated the only likable character like shit the whole time"
That's a big part of the story.
"It could’ve been done better as a 30min short, so many scenes were way too long and just pointless. "
I don't know. I thought this made it more agonizing given you knew something bad was going on. This movie made me more  uncomfortable than Hereditary (which you are right is a masterpiece). >

Very fair!! I think how they treated Dani was a big part of it but it still rlly bummed me out and made the rest of the cast very unlikable. I didn’t find one other character that exceptional except for maybe Pelle, the rest were just annoying and pointless. 
My opinion on the long winded scenes are probably very unpopular but it came across as pretentious to me. Like near the beginning the snowy window scene was at least 60 seconds long, the rituals were very drawn out and didn’t seem to bring much for the story and they kept going back to the same scenes it seemed. But Ty for the reply! I love seeing other perspectives. >

"I think how they treated Dani was a big part of it but it still rlly bummed me out and made the rest of the cast very unlikable"
I think you are actually describing the strengths of this movie. The whole point, and it is a disturbing point, is that Dani is actually getting what she emotionally and socially needs from this insane death cult.
She has no real support or close friends after her family is killed, which makes her all the more susceptible to willingly accepting and happily being part of the cult.
Perfect example: Think of how her boyfriend reacted to Dani's family's death. He has almost no empathy towards her, and in all his interactions it is clear that he does not want to even be with her, let along comfort her.
Then when she finds out her boyfirend is cheating on her and she is distraught, what do the other cult women do? They cry with her. They share in her pain, and give her a sense that they are by her side and that they understand.
For a woman who has gone through the ungodly amount of grief that Dani has, an experience like that is easily the most powerful, and cathartic feeling she has had after the death of her family.
And yet this is being done by a lying, nefarious cult what participates in human sacrifice.
It's brilliant horror. Think of it as an oddly 'positive' horror story.