Well, Serena confesses her Cinta for Nate at the last book, but Nate texts both her and Blair that he's going sailing atau something (meaning he won't tarikh either of them). So basically, Serena ends up with no one (definately not Dan since their relationship lasted about one and a half books). But the new book "I Will Always Cinta You" is coming out this November. Only then will we know who Serena will be with. It could be Nate atau it could be a new character. Who really knows. I guess the real answer is that we'll have to wait until the seterusnya book comes out to see what happens then.