Im Confused

So I took off her shirt. Then she said,
"Take off my skirt."
I took off her skirt.
"Take off my shoes"
I took off her shoes.
"Now take off my bra and panties."
And so I took them off.










Then she looked at me and said, "I don't want to catch you wearing my things ever again."

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.