That's how I feel too. When he first appeared, I thought he'd definitely be that second lead I'd support, but maybe it's because of the author's delivery? I don't like him as much I thought I would. He's better than the main lead because he cares and he's thoughtful, but at the same time his relationship progression with MC seems unnatural ...
Yesss I think the reason why I feel this way is because he’s kinda acting like an ex that was wronged or as if he’s the ML. Like his actions would make a lot more sense if he were the main love interest especially the asking him why he wasn’t texting him back while obviously drunk.
HE ACTS AS IF THE MC OWE HIM SOMETHING (just came to that conclusion)

No hate I know he means well I just don’t like the way he keeps approaching the MC. He appears around the MC and acts as if he knows him well all because he knows ONE secret. I also don’t like how he inserts himself. Again I know he means well it’s just he’s doing too much.