chillie my dudes it was a joke. what we see from trailer is that theyre talking about being friends and hooking up together;)nothing about being boyfriends. so saying theyre gonna be a couple is imo overinterpretation but as you said- believe yourself if you want!
part 2: https://youtu.be/JfqJRrq3QGk
part 3: https://youtu.be/Xs9ubMNq6NI
part 4: https://youtu.be/4sQK1hnTqSE