Read emma

It's not the same lmao. In Emma both parties are mutually attracted to each. Here, it is one-sided. Mary (maid) was never in love with the nobleman and it is implied she is a relationship with that officer/police guy (commoner) for a while enough to be engaged. If the noble guy tried to pursue her, he would only trouble her and genuine would be a spoiled selfish immature noble. By decided to give up, he respected her feelings over his own (she's clearly in a good relationship with her fiancé after all)

Btw i loooooove Emma but, let's not throw other manga about love affair involving maids under the bus just to get others to check it out ^^""""