The singer depicts a now one-sided romantic relationship about to end in soft but brutally honest terms:

The term used for these more one-sided relationships, which are mostly beneficial to one participant, is facilitation.

She has a one-sided, mostly physical relationship with Ramir at the beginning of the show.

He knew, or thought he knew, that Wilfrid was the last person to endure a one-sided relationship.

It's kind of a weird phrase, and it doesn't sound like it means a one-sided relationship.

This is somewhat related to the concept of parasocial interaction where audiences develop one-sided relationships with media characters and celebrities.

It was a one-sided relationship, heavier on my end than on his.

It was no longer a one-sided relationship.

This means that you continue to date, wanting things to change, or enjoying it for what it is: a one-sided relationship.

Kole has been seen to have an apparently one-sided relationship with Jericho.