Ever since you joined the Golden Dawn with Yuno, he can be a bit standoffish and maybe a tiny bit harsh but he actually regrets it because he can't be honest with his feelings. He's a tiny bit grateful that you aren't with him 24/7 because he works with Klaus and Mimosa since he is used to them. He never mentions about having any feelings for anyone, you specifically, to anyone at all because he would just easily deny it and just leaves to finish everything off.

When you were assigned to do a dangerous mission by working with Black Bulls to head to the Underwater Temple in Raque to get the magic stone that the Eye of the Midnight Sun was planning on getting, Yuno was like 'OH, HELL NAH!' but you left and came back after a week and he was not himself for a while. Thankfully, he didn't have any missions during that whole week and just wondered in his room if you're able to survive or whatever the outcomes that could possibly kill you.
When you returned to the Golden Dawn base, Mimosa and Klaus were the first ones to notice you, and Yuno just bolted downstairs and pretended like he didn't care and that he was "jealous" that you went to the Underwater Temple with the Black Bulls without him.

"How can you be so stupid?! Look at yourself! You're covered in bandages! It would've been better if I went instead of you!" He said with a tone that feigned jealousy but he was secretly happy that you were alive and not dead.