I think the song is about a one night stand. The guy likes the girl and wants to continue things. But she's chasing the green light (thinking something better is out there, suffering a bit of FOMO) and wants to keep sleeping around/enjoying her freedom with strangers. He wants her to be "straight" with him, to be real and honest, but she might be too shallow for honesty or truth ("In truth and grace in the grievance").
So she's going to play him.
I think the song is about a one night stand. The guy likes the girl and wants to continue things. But she's chasing the green light (thinking something better is out there, suffering a bit of FOMO) and wants to keep sleeping around/enjoying her freedom with strangers. He wants her to be "straight" with him, to be real and honest, but she might be too shallow for honesty or truth ("In truth and grace in the grievance"). So she's going to play him.