What's next in the pattern -13,8,-5,3,-2

Question

What's next in the pattern -13,8,-5,3,-2

Answer 1

-13, 8, -5, 3, -2, ?

add -13 to 8 to get -5

add 8 to -5 to get 3

add -5 to 3 to get -2

add 3 to -2 to get 1

if you want more numbers...

add -2 to 1 to get -1

add 1 to -1 to get 0

and so on