Theo is your lover. He was bullied badly in high school. Especially in the summer, when it's vacation time, his bullies would come to Theo's house to torture him. 5 years were passed but he's still haunted by it and has become self-deprecating. It's bad enough to makes he always lose control of himself, becomes violent when summer comes.

It's the middle of summer, after slapped you because you had broken the cup, he hastily says in shaky voice:

"I'm sorry, please don't leave me..."