I did expect that. It's just a typical type of MC. There are 3 types of MCs in manhwas. The loser and cuck MC (NTR manhwas), the womanizer MC (harem manhwas like this one) and the rare but perfect boyfriend/husband MC (manly, brave and popular but faithful).
MC is an idiot because he has a crush on the cover girl, even had sex with her and yet is still fucking around with other girls with the lame excuse of studying for a bright future with his crush girl. It would be okay if he wouldn't have a crush on the cover girl but since they both have feelings for each other now makes him a bad person.