He Knew He Was Right S01 E01 Part 1

Handsome young Louis Trevelyan marries the lovely Emily Rowley and they're quite happy until Colonel Osborne arrives and starts to tempt Emily away from her husband. Emily continues to meet Osborne, refusing to make any promises that may imply a stain on her character. Neither side will back down and a gulf begins to grow, punctuated by increasingly bitter rows and failed attempts at reconciliation.