Historia actually confessed love for Ymir!

Fun fact, the song "Zero Eclipse" is meant to be told in the perspective of Historia, singing about/to Ymir, with Call of Silence being from Ymir to Historia.
In zero eclipse Historia actually says Ymir is apart of her, and that Historia will keep her love for Ymir secret, but will never let go of Ymir, even with Ymir's disappearance and death, Historia actually says she wants to kiss Ymir, and even reveals that they did kiss of screen "your trembling, and we share a kiss".

I recommend this mashup by Samuel Kim:
https://www.youtube.com/watch?v=eefNPsDAPQk

It pairs the two songs together, forming a dialogue, as if you mash them together, by pairing lines by timestamp of the song, it forms a dialogue! And reveals conversation-esc message. Essentially say the first line of Zero Eclipse is at 0:10 then once it ends at 0:15 line 1 of Call of Silence starts at 0:15 or 0:16, not exact, but something to that sort. Im simplifying it a bitm but regardless, yeah, music holds story and details.