
all of the emotions because of what happened might be the reason why he gave that expressions and reaction. taeju's just anxious and thinking that he's really incapable and undeserving to have euihyun. for now, i agree to one of the comments here saying it's somehow good that their offspring was gone, given that they are still in a bad situation.
just like somebody said, they need this for a clean start. now, what they need to do is to talk. open communication is, after all, the best thing for couples in manhwas to do (that authors love to take away for angst!)