Suterare Hanayome no Saikon: Koori no Henkyou Haku wa Saiai wo Chikau

Chloe has just finished a five-year contract marriage, despite being abused by a hostile marquess family.
Unable to decide what to do with her life after the divorce, she finds herself living with her former fiancé and childhood friend Theodore, her first love! He has become a frontier count, but he remains as kind as he ever was--and he is still the same man.Chloe has begun to be attracted to Theodore.

(Source: Kadokawa, translated)