I remember a movie with a boy and he wears girl shows the next door moves a girl a the become great friend the boy has a tree house near his house he and the girl go there everyday the the boy helps her paint the house but 1 day he calls up to her and her parents said that she died
Bridge to Terabithia (2007)?
http://www.imdb.com/title/tt0398808/?ref_=fn_al_tt_1
or, if you don’t remember an excess of CGI, more likely the older made-for-TV version: http://www.imdb.com/title/tt0088853/?ref_=fn_al_tt_2