It's neither of those things. The main character is still in love with his ex who recently dumped him to appease his dad who disapproved of the relationship. So MC studies hard follows him to his new high school for the elites, in hopes to get back together with him. His Ex however has forced himself to move on, because he has no intention of disappointing his dad.
The other guy on the cover is the dude who he admires, and is helping him move up in the ranks at the school to get his Ex's attention, but encourages him to rank up for himself, and not just to impress someone else. MC gives up on his ex, and this guy becomes the love interest for the MC.
Is this a love triangle or a polyamorous relationship? Is there cheating ? Because I don’t really like these tropes …