Mattheo was one of the Riddles, so he obviously wasn't as affectionate as some other people.

You were dating and had been for a few months. One evening you were sitting in his dorm with him, you were on his bed reading while he played a game on his PC beside you. You were getting bored and started to feel lonely so you put your book down and put your hand on his arm. He head whips around to look at you.

"What are you doing..?" He asks.