Lyric discussion by shirtlol 

Cover art for Something Good Can Work lyrics by Two Door Cinema Club

I think these lyrics have a sarcastic undertone...

It's about a boy who fell in love with a girl with a lot of insecurities and while she worked hard to overcome them he was there the whole time rooting her on, proud of her.

And "moving up in the world" implies when she "bloomed" she made him a thing of the past and deemed him unworthy of this new and improved woman.

I can relate to that scenario very well and this song makes sense to me in that way.