
This update was just as the title says "sweet as hell" like it's all sweet moments spent with your lover but the conversation and actions don't match and you can tell just how bitter the seme still is, and how almost toxic the uke can be for him.

Being mad and bitter is not the same .
And when you love someone for years and they constantly fuck with you yes your going to be insecure ab it he fucked u over for years knowing u we’re waiting and now nobody’s left he loves you which we know he’s serious but the mc doesn’t know that bringing it up and the bottom saying he loves him is reassuring that he doesn’t need to be insecure

" bitterness - Indignation or ill will stemming from a feeling of having been wronged or offended. See Synonyms at anger. " This is quoted from the Oxford dictionary. Yes it's Synonyms with anger and resentment.
" (of people) lacking confidence and doubting their own abilities " This is quoted from the Cambridge dictionary.
In my opinion, the seme was bitter which is why he brought up the past incidents he also now like the uke feels insecure in their relationship.
I don't have time to stress my point of view further to get anyone who doesn't understand it after all my explanations, so let's agree to disagree here. Although if you all were following along with me you would have already picked up that I was agreeing with some of your points, just looking at things from a different perpective.

Also
Anger is about a present hurt; bitterness is about a past hurt. When we feel angry it's because of something that just happened. ... Bitterness lingers from something that happened in the past. Bitterness leads to resentment and holding a grudge.
He’s not hurt in the past he’s still hurt now he’s angry
Hachi should suffer more, but I actually like that he immediately states that he will not sleep around anymore because it bothers Amami.