Does eragon marry arya?
Nope. Eragon and Arya are at an agreement. One: Arya doesn’t love Eragon that way. Two: They are in the middle of a war. In the fourth book, if they manage to kill Galbatorix, then they might. IF Eragon and Arya did get married, an elven princess and a human dragon rider would forge an alliance between the elves and humans.