I agree but this is a realistic story. If you break up with someone, not because of hate but things are just not working out, it's normal to miss the other party (at least that's what I think).
I agree. It also seems like hyung did not break up with Jeongwoo because he stopped loving me but more becausr he was busy and felt like he could not give his all to their relationship.
Hyung has not actually done anything out of the line either so he is ok. I really like how his character is portrayed actually, very realistically as you pointed out. Small pettiness and jealousy are flaws that make human human.
I'm sorry but you broke up with him. You have no right in getting angry with who he is dating or he likes or whatever. It was your lost.
Also dont stalk them if you don't "like" them is2g.
(Ship get together quick pls)