Why did Olly betray Jon?

Related questions

1. Who stabbed Jon Snow in the heart?
2. Why did Robb Stark die?
3. Why was Ned Stark executed?
4. Why did Jaime kill aerys?
5. Who cut Arya's hair?
6. Does yoren die?
7. How many times has Jon Snow been stabbed?
8. Does Arya get her sight back?
9. Does Ned Stark die in Season 1 Episode 9?
10. Why did the Mad King go mad?

Tags

1. #tormund
2. #destroyed
3. #wildings
4. #rescue
5. #everyone
6. #making
7. #wildlings
8. #betrayed
9. #watch
10. #village
11. #alliance
12. #understand
13. #fought
14. #night
15. #decides