This is just showing the groups he's in (note not all of them are romantic only a couple are okay?) 

Kay, Koy, Bakugou: Childhood Friend Group 

Kay, Koy, Todoroki: Trauma Group 

Koy, Momo, Todoroki: Crush Group 

Koy, Kashi, Mei: OC Crush Group 

Denki, Koy, Sero: Prank Group 

Denki, Koy, Mei: Poly Group 

Denki, Koy, Kirishima: Workhorse Group 

Aizawa, Koy, Shinsou: Training Group 

Koy, Kirishima, Tamaki: Internship Group 

Deku, Koy, Bakugou: Childhood Group (basically same as the first but just these three) 

Jiro, Koy, Tokoyami: Emo Group 

Koy, Mina, Kirishima: Party Group 

Yeah, that's about it, if you guys want I can do one for Kay next