Almond is terrified that Latte is the Aries with a birthmark who will bring him bad luck in love, yet he wants to be around Latte all of the time.
When Latte and Lukpeach already had plans to go shopping together, Mon wanted to go too.
And was visibly upset when he was told he couldn't.
He followed them anyways and was still upset the following day.
This isn't the first time Mon has gotten upset that Latte's attention isn't focused solely on him.
But what's stranger is that not only does Mon want to be around Latte all of the time, but he also includes Latte in his fantasies about the boy Mon supposedly likes.
Even though Mon has to wake Latte up for school to make sure they get there on time,
Latte is constantly taking care of Mon.
So although the entire plot revolves around Mon (and his roommates) trying to get Jumper,
It's clear who already has his heart.
It's the guy who actually knows where his heart is.
Mon is in love and doesn't even realize it.