no love lost

first love

The thing, place, or activity of which one is fondest; one's most fundamental interest or attachment.

for the love of the game

Doing something for one's own enjoyment or other intrinsic desire to do so; not for other reasons such as money or other ulterior motives.

get lost

To exit from the scene.

labor of love

A task performed voluntarily without expectation of reimbursement; an altruistic work or undertaking.

look as if one had lost a shilling and found sixpence

To look very disappointed.

look as if one has lost a shilling and found sixpence

To look annoyed or displeased.

lost cause

A person or thing that is hopeless or futile.

lost errand

Synonym of fool's errand.