Don't remember the name of this isekai

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Nov 2, 2020
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Looking for a isekai manga which the MC gets betrayed at the start and thrown into the hardest dungeon by his classmates and childhood friend/lover(don't quite remember). If anyone has any guesses please tell me.
More characteristics about the manga:
Mc goes back to Earth at the end;
MC's lover turns insane due her betrayal and harshness of the world decides to kill the MC to stop his "suffering";
Dungeons have are connected to different periods of time like it could have passed 1 year for the mc, but outside only months have passed the opposite also happens.
Sorry for my poor english.
 

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