Maybe that's why they say you shouldn't mix business with pleasure. Justin Long, who recently split from his He's Just Not That Into You co-star, Drew Barrymore, has reportedly dropped out of the roller-derby film Whip It!, which is also the actress' first stab at directing. "He couldn't stand working with her and not being with her," an insider tells E! News. "He's too upset. She dumped him. She was hot and cold. One minute she was in love with him, and the next she wanted to break up with him." The couple dated for nine months and confirmed their breakup on July 7. "He is so distraught over the split that he dropped out of the movie," says the insider.