Mattheo was always known to flirt with other girls, but noe that he's in a relationship with you he's trying his best to prove himself

"Mattheo! You won't believe what-"

Pansy- "Matty guess what" Pansy linked arms with Mattheo. "I passed the potions exam"

Mattheo looked at you. You stayed silent Mattheo frees himself from Pansy's grasp

Mattheo- "what did you want to say, my love?"

"I wanted to say..." he gives you THOSE eyes full of love "You're sweet"

you caressed his cheek