Johnny Stevens actually explained the meaning of this song in an NME interview:
What was the inspiration for ‘Lydia’?
“She’s my ex-girlfriend and was one of the first people I met when I moved to Brooklyn. We became domesticated and eventually realised we weren’t pursuing our own goals; we were just watching Netflix, getting high and eating chicken pot pies. It’s about the two of us walking away so we could become the people we were meant to be. I played it to her before we released it – she liked the song.”
Johnny Stevens actually explained the meaning of this song in an NME interview:
What was the inspiration for ‘Lydia’?
“She’s my ex-girlfriend and was one of the first people I met when I moved to Brooklyn. We became domesticated and eventually realised we weren’t pursuing our own goals; we were just watching Netflix, getting high and eating chicken pot pies. It’s about the two of us walking away so we could become the people we were meant to be. I played it to her before we released it – she liked the song.”
https://www.nme.com/blogs/nme-blogs/we-re-not-into-butt-rock-meet-highly-suspect-the-wildcard-grammy-nominated-us-answer-to-royal-blood-12941