
Apparently I am the only one who doesn't think the neighbor is a bad guy ╮( ̄▽ ̄)╭
I actually believe that he has simply been with Kachou since forever, that he is crazy in love with him and that he is just trying to monopolize him, which makes me feel sad for him to be honest :(
SPOILERS:
Thankfully, he has his own spin-off: https://www.mangaupdates.com/series.html?id=133747
I am doing my happy dance right now ☆*:.。. o(≧▽≦)o .。.:*☆

The sly eyes, the scheming, the manipulating, the possessiveness--it's a misdirection. But he could have gone either way, plotwise, as I put in a comment yesterday--either he's in love and wildly jealous or he's a sadist and controller. I'm glad he's not a sadist. :D But when you separate someone from the person who makes them feel happy, safe, and at peace, that makes you a "bad guy" in a kind of way.

Well, I do get why his actions and words in the previous chapter didn't help to make a great impression to us readers. That's why, in my comment, I didn't write "I think he is a great guy" but I wrote "I don't think he is a bad guy". And for me there is a difference between those two.
Of course there was a huge possibility that he would turned out to be an monster and that I was the one miscalculating him (I am glad that's not the case, though. I really like him now :) )
That being said, you are right, to "separate someone from the person who makes them feel happy, safe, and at peace" isn't something anyone should be proud of doing. But to be fair, when you fall in love, you become selfish. You want the person you love to be happy, but you want them to be happy with you, you want them to be happy because of you, cause deep down you want them to make you happy as well. Of course that's egoistic and not applaudable but it's also very human. I mean, anyone who falls in love feels and (maybe) acts that way, at some point and level ╮( ̄▽ ̄)╭
So to summarize, I know his signals didn't make him look as one of the greatest characters ever drawn in the yaoi world, but for me they didn't make him look that hateful either. He simply looked like a flawed human to me...
I don't know... I am over-analyzing things again ( ̄∇ ̄")
p.s. thank you very much for your reply and sorry for my long response! I always enjoy reading other yaoi fan's opinions (●'◡'●)ノ

Except he was "the bad guy" until he realized he was just that and stopped and wen tto help them get back together. He's not a full-out monster, but in this story, he has been the bad guy/interloper/selfish-divider. The selfishness that says "me, me" over someone's true love and mental health made him bad. But now, he's learned, grown, and we hope is happy, too. :D

I do believe that the most interesting and constructive conversations are made with polite people who have different opinions than you, so I agree with you :) I know reading yaoi is just a hobby but sometimes there are so many things to gain and learn while discussing them!!!
Back to our topic, I think we might have a different definition for who we call a "bad guy" in this situation. I think I use it more like a "bad, ill willed person" in general, when I sense you use it more like "the bad character, plot-wise, who will cause the necessary trouble for our story to develop". Correct me if I am wrong though...
As for him being selfish, as I mentioned in my previous response, I agree that he acted egoistically, but I still find it a predictable, human behavior. Certainly, a mistake but not something strong enough for me to label him as someone bad.
And in his defense, he didn't know that he was Kachou's true love in the beginning. He just thought he was like one of the girls Kachou had until now. Once he realized that, that wasn't the case, he stepped back.
So in general, he gives me the impression of a heartbroken, a little bit damaged, but sensitive and caring person ╮( ̄▽ ̄)╭ Let's not forget that the abuse his brother suffered, affected him as well...
I don't know... Maybe I too soft with human flaws sometimes ( ̄∇ ̄")

"only with Tobita was I ever so scared and sad"
the way I see it, only the ones we really love can really hurt us, only the ones we really love can kill us. when you fall in love with someone you automatically give them a power over you.
when you develop feelings for a person, a beautiful but scary space is created inside you. a space that no matter what will happen in the future, either if this person takes this power you gave them to cherish and treasure you, or if they use it to hurt you, this space will never go away... it'll always remain there, inside you, a piece of you that will never be entirely yours. and that can be very frightening.
I am not into BDSM, but this manga took the subject in really new depths... I love how the author shows us how different and in the same time, how deeply connected physical and emotional pain are... it is truly a beautiful read (▰˘◡˘▰)

http://www.mangago.zone/read-manga/love_delivery_chako_nediwo/mf/c001/24/
wow, sex scene with naked seme and still clothed uke... that must be a first (≧∀≦)
Although it had such a beautiful happy ending (and maybe Natsuki-san's husband was Haruzono in the end - even happier ending) this oneshot left me with a piercing pain in the chest and crying...
Maybe it was the bittersweet feeling of having your heart broken for the first time or maybe the nostalgic pain of the "what ifs" from the life you passed by, just because you were too scared to live it...
It had me thinking though... I know that your other half might be someone of the same gender as you, but what if your soul mate is someone of a gender you are not sexually attracted to? What if father's destined one was indeed his son's mother? Yes, they won't have a sexual relationship anymore, but there is true love between them... Isn't that more important and fulfilling?
p.s. I am desperate to turn this one to a happier story, aren't I? I don't think I am doing very well though (I mean, I am still crying XD)...