the main couple are aware of eos feelings but aren’t together right??

From the previous chapters you'll noticed Zhang Xi was absent minded lately. He's thinking or trying to figure out about everything about them—especially Jian Yi—and without hurting him. His mere existence is significant to him. They already had a mutual understanding and respect to begin with. So, yeah.

I may be wrong but after the confession thing where he asked Jian Yi if He Likes Him. He said "I know." atvthe last panel. So I think he already knew it from the beginning and just confirming it from Jian Yi's lips.