While I partially agree with you, I don't think it's fair to only label him as the token "asshole" of the story bc of that. The guy also struggled with his own issues (affection towards Heesu, guilt, selfishness, etc.), which made him act the way he did. I'm not saying he's 100% excusable, but hey, he's human and he's trying his best to fix shit. For me he 100% deserves a chance. His character seems really human and realistic tbh
I disagree, where does he look TRULY guilty? He smiles and makes it seem like Heesu's pain is "for the greater good", but it is just for himself. To avoid the hassle of Heesu cutting ties with him. You say he's "trying to fix things", i'm assuming you mean the "matchmaking" (in quotes because matchmaking has positive connotations, he just wanted to shove Heesu's feelings off onto the 1st person he could find), if he felt like he was "doing good" by the matchmaking then why did he feel guilty and not tell Jiyu his reason for helping Seungwon just now? He knows his way of handling things is shit. Point out to me where Chanyoung has really "struggled" with this, he just looks troubled, like it's a hassle rather than that he doesn't want to hurt Heesu. Any "help" he tries to give is just to soothe his guilty conscience... It's a superficial guilt at knowing his actions are shitty, not stemming from feeling bad for Heesu.
What you're saying is pure interpretation. Those are your feelings based on what you observed. I made a topic just above yours stating my feelings and interpretation about the whole situation, which are quite different. It's not a topic where we can objectively state he's being superficial and douchey, because the story hasn't completly unfolded and it's common for authors to add backstory and focus on side-characters later in the story. This story seems complex. The plot is simple, but it seems to me that the characters have depth, thus the way Chanyoung is drawn and writen here doesn't feel like his complete self . Notice how in a lot of mangas/manwhas, some side characters are initially not as developed as others right away? How those same characters personalities make a 180 once the author decides to go in-depth regarding their past and the reason for their behaviour? That's because they gain importance later in the story, and a story must have suspense. That's my interpretation and I'm not here to preach any truth, so feel free to disagree

Everyone knows he's straight, no one is irritated at him for not liking Heesu back, that's such a moot point. I've said this before, but Chanyoung himself has said he's "being mean" (actual quote) and just now he refused to tell Jiyu why he is helping Seungwon because he knows that the way he is handling things is wrong and feels guilty about being an asshole. If you want to plead the case of a character that thinks himself that he's an asshole, feel free, but it seems illogical. Put yourself in Heesu's shoes, would YOU want your crush to purposely go out with multiple people JUST so that they could flaunt them in front of you to hurt you into giving up? Would you be okay if you found out that, for years, your crush knew how you felt and found it troubling enough to try to hurt you into giving up? How is that a "better" rejection? Is a long lasting pain better than a quick one somehow? As far as their friendship, Heesu and Chanyoung were friends for quite a while, i find it likely they would've stayed friends and gotten over it. Where was this supposed to go? For how long? Was Chanyoung going to make Heesu watch him get married? Have kids? There is a difference between inviting a friend to your wedding and inviting them to your wedding with bad intentions to hurt them. If the way he handled things was "good", why did it trap them both in a stalemate with things only looking bleak till Seungwon came?