Yeah but Mileys relationship with Nick was a big deal to her. Its pretty obvious it was more than just a silly "teen" relationship
Considering Nick JUST wrote another song about her. Just because you are in your teens doesn't mean the relationship didnt mean anything.
Also Miley and Selena were never friends so they arent losing friends over a guy. Nick and Miley were super close which Miley has said many times. Selena and Miley will never be friends