Cut him some slack, he led a hard life with his a**hole father and all.. So i dont think he will end his life for a petty reason like a stranger he met for a couple of months fooled him because that jerk was lonely and he conveniently look like his gf or that girly excuse of him regreting not choosing chun sam (come on hes much more deeper than that) .. Remember his father drove him out of his apartment saying he is just atrash without his father and chun sam at that time was meeting that girl min gyeom assume was his girlfriend so basically he has no one to rely on except that guy .. And him being betrayed just cemented the last trust he have to anyone and just chosing to end it all.. And you were also right about him being manipulative and feeling a little superior with chun sam (he even said it himself) but didnt he learn from his selfish mistakes (didnt he get his karma by being led on by that jerk)
I know his not the most loveable character here (even i dont like him that much) but at the very least understand his character more cause from what i read i dont think you did,sorry
..he's not complaining for having being a victim of abuse or what. He's mad because he has been used as a substitute when he thought he was in the first place, and as he believed that, he was perfectly happy with the "bad guy". Up to now, I pretended to believe that time he tried to commit suicide because he was desperately in love with Chun Sam and his entire life had been wasted on the wrong guy just to have a comfortable place to live at, but I had some doubts and this confirms them all: he actually felt betrayed. Yes, he loves Chun Sam but only after a long series of selfish considerations. The more this story goes on, the less I like Min Gyeom. His love for the pure Chun Sam is far from being honest. He's just the kind of guy why can clearly see when someone else is being hypocrite, because he's a genuine one in the first place.
Spare me with any kind of pathetic considerations about his father. That was not a nice spot for him either. Yes, his father was an unforgivable bastard, but he acted so coldly that is not reassuring. Chun Sam has a big heart, and it's dangerous to give that kind of generosity to someone who is so skilled when it comes to manipulation. And if you think he's not manipulative, then reading idiotic plots brainwashed you to the point you can believe anything at all.
Next chapter, if I'm not wrong, they are finally supposed to have sex: well, after all he has done for him, it will be a decent reward, if not the greatest love ever. Great love surely has another shape, sorry, people.