Thoughts forever

Why is that attachment is so important in life...why can't we just be caring and loving with out developing attachment...When I was a kid, One day i asked my dad that why do we keep changing places every two years..I have friends here and i am happy with this place..i love my room and the city too..He answered me saying that my job demands moving places and its good for us....he told me that you should be loving this place with out actually developing attachment towards it...At the age i wondered whether it would be possible that you can love some thing and never get attached to it and i felt that it would not be possible...but as i grew up i actually learned from him that yes you can love with ...