Why is there so much hate towards Jaeha? I get you might feel that way if you have never been in long term or hurtful relationship but Jaeha's actions are actually kinda understandable. Yes, he's obviously hurting Eunho but he needs some understanding too.
If relationship makes you miserable it's better to cut it off. Hardships are normal but if you constantly feel insecure or can't feel happy the relationship can't grow and will only hurt you both. Yes, breaking up will hurt your partner, and you too, especially if you agreed to being together after long time reflecting on it. However, it's better even for your partner to let them move on and not tie them to fruitless relationship. Breaking up is hard and will create wounds but in the end forcing you both into relationship that won't get anywhere is much worse.
Jaeha clearly couldn't fully relax in his relationship with Eunho. He's still too insecure (at least at the point when they broke up) to stay with him and feel truly happy and you can't really blame him for that. He's been hurt too many times before and he keeps blaming himself. You can say that he's just running away but you should remember everyone's different, not everyone can cope with same things as well. Sometimes you just can't and there's nothing you can do about it. And that's okay. No ones wants to get hurt again and Jaeha is also afraid he would hurt Eunho even worse than what break up would do. Therefore he feels breaking up is healthier for both of them and in reality too that is an actual good choice.
A relationship can't be founded on one person's strong feelings alone. Since they got together by Eunho pushing it, even if Jaeha loves him it doesn't automatically mean he can be comfortable, happy and feel secure with him. Those things have to be mutual in order to make relationship last. These two need time and Jaeha needs more confidence and neither of them is at fault for that.
You're right. Jaeha's emotional constipation fucking frustrates me to no end, but I don't see the point in demonizing him like that. After all, Eunho was also pushy af (now too) and I find hard to believe he didn't at least vagely know what he was getting into.
Dear Old Xian, I'd greatly appreciate if you could cease making my heart cry in just one frame (like in page 7). I'm almost out of tears already.