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This may contain spoilers
I think he may be feeling like that because he wanted to stop but felt like he couldn't...? Or because he noticed how the mood was off and they didn't do it for the right reasons. Also I feel like Jun was in fact kinda angry at him so that's why he was testing his limits and kinda turning a blind eye to what chun was saying or how he was acting, even thought he noticed that chun was kinda uncomfortable and unprepared. I don't now, I personally didn't like how it went down, it was forced and uncomfortable in my opinion. They need to learn how to communicate those feelings and of course to NEVER take out anger or insecurity with sex, that's just a big nono
I just hope the author is using this to talk about consent and the feelings that may arise while having sex and not just using this for pure drama, but to be honest I'm having my doubts. Anyway, lets wait and see :p