Anyone feeling the same as me?

Okay so, you know the scene in Horimiya where they had sex, right? The time when I was reading it, I was happy for them, blushing and such. But now? When I saw the pictures from that scene in anime, I don't know what I really felt. Was I feeling shy by seeing it? was it disgust? Or am I just jealous? I was so confused because I felt so uncomfortable and I don't get it why. Maybe I mistook my jealousy as disgust but why do I feel so conflicted like I hope they didn't include that in anime.

Please don't get mad at me. It's not like I'm really against it. Just confused why am I so bothered by it when I used to loved them and cheer for them. In fact, I'm still reading the manga.