 If you liked
Code Geass: Hangyaku no Lelouch
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 ...then you might like
Yahari Ore no Seishun Love Comedy wa Machigatteiru.
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let me start by saying this: These anime are totally different in genre; Oregairu is school slice-of-life and Code Geass is sci-fi war
now here's why they're similar: the main characters are both the good guys with good intentions, but they play the roles of the villains in order to help others by becoming hated, and also, the main side-male character plays the role of the good guy who is against the main characters' decisions even though they know their intentions