Dawson and Joey finally got together after the whole summer without a single phone calls. Everything went well including sleeping together (finally).
However, before the birthday celebration, the whole relationship was ruined by a single phone call from a girl Dawson was seeing.
This was totally heartbreaking for Joey, knowing that all summer Dawson was actually with another girl. She of course decided to let Dawson go and to go on with her life. Everytime when they finally get together, there is always something else that break their relationships. This is a way to get viewers to watch more and keep waiting until something really happens between them which will never get them apart.
So ... do we need to wait forever, and then ... what happens? They never get together again?