This is not a romance novel, of course, but I highly recommend it.
Maybe He Just Likes You
by Barbara Dee
https://www.amazon.com/dp/B07P56K21Y/ref=dp-kindle-redirect?_encoding=UTF8&btkr=1
If I were you, I'd slip this book in with a few very sweet, benign early teen romances (like Sweet Valley High - books that involve crushes, some flirting, and maybe a kiss or a date at the end . . . )
Going back to Maybe He Just Likes You, I read it first, then gave it to DD, who devoured it and then passed it on to a few friends, who read it, too.
And though DD is not a big "talker" when it comes middle school social life, we've had good conversations about the book. Not all at once - small snippets here and there -- what she thought was realistic, what wasn't, what types of similar things she's noticed/heard from/about her classmates etc.
More than anything else, it helped us talk a bit about boundaries and opened up a line of communication for the future . . . .
Anyway, sorry to co-opt this thread. But IMO, this should be required reading for all middle schoolers - girls and boys, both.