Unfortunately they don't get back together in TDWT 또는 TDROTI. There's no TDWT special so we don't know what happened after the finale of TDWT. Also in the first episode of TDROTI, ccccccDuncan is seen making out with Gwen on a 보트 with the rest of the cast. Courtney's on the 보트 too but she's angry and looking away from them.
No, because on the beginning of the first episode of TDROTI, Gwen & Duncan were 키싱 on the 보트 and Courtney was there too, but she was not with anyone. But that does NOT mean they will NOT be together again. Lets just 십자가, 크로스 our fingers and hope they will.