Well, Ae Supachai kinda confirmed that Matt is not the third hand, because Aum and Hiso Pok has broken up for 3 weeks already. But then Ae keeps shading Matt on instagram, posting strawberries in the stories and saying stuff like sure, they weren't always holding hands, but they were holding hands going to the bathroom and when they went to the party, and that they didn't do anything wrong since he's single, but so fast since it's only been 3 weeks.
Songkran defended Matt and said that it's no big deal to hold hands, and that Matt and Hiso Pok has known each other for a long time, and that he's still Matt's boyfriend. Matt had also said at the time that she texted Aum to clear things up and that she and Hiso Pok are like brother and sister.
Doubt this drama will end soon because everyone is going back and forth.