You — Adele - Someone Like

Adele wrote the song to come to terms with the end of her first "real" relationship. A few months after they split, her ex was already engaged to someone else.

The song’s global dominance was largely fueled by a single, legendary performance. Someone Like You (song) | Adele Wiki | Fandom Adele - Someone Like You

While much of 21 was fueled by the anger of a breakup (think "Rolling in the Deep"), "Someone Like You" represents the final stage of grief: acceptance. Adele wrote the song to come to terms

Adele mentioned she wrote it because she was "exhausted from being such a b***h" in her other tracks and needed to write something that made her feel okay with the two years she spent with him. Adele - Someone Like You