He is not a poor guy. He is an emotional parasite. A way more toxic personality than Luca or any 'aggresive' type of person. People like Harry drain on your emotions constantly because they use you for their emotional stability since they cannot have it on their own. A person like him in RL is way more dangerous to cross paths with than just an idiot with an ego and a big dick like Luca.
If you don't think people like that exists and are toxic as fuck, even if they never go into a more superficial toxic behavior then I'm glad for you not having encounter one. Harry is the typical persona when/if he snaps, threatens he would kill himself if you dump him.
C'mon fam, where did he show his emotional parasitic behaviour? Emotional parasite you mention here is Laura and to some extent even Aya especially in the current update. Laura is always trying to emotionally manipulate him. Using emotions to control him is a parasitic behaviour. Harry is just choosing to believe in the good in her. I do agree with people here that he's dumb for being this naive, sadly. And about the emotional stability part, when you love someone, people do emotionally get attached to them. That's not searching for emotional stability.
And in none of the routes so far has he threatened to kill himself. In fact it's the women in this series who have used this kind of manipulation. In two of the endings, the fool doesn't do anything after he finds out about the cheating which i agree makes people frustrated. And when he really did snap in the "abrupt ending", he actually went to kill Luca and maybe Laura too which is not explicitly mentioned but that's how anyone would respond when they are betrayed like this by someone whom they really love. So far that's the only ending I liked.
In this update, I did kind of see some sort of positive action being taken by him during the chat with Aya at Ferris wheel where you see his emotions come out. I hope he does more of that in this route. That's upto the author.
In all, just give Harry a break. Hopefully we'll see redemption arc of some sort for him in upcoming routes. One can only hope