Well, it depends. Sure if you dumped him because he was a drug dealing porn addict? But if he was someone you cared about, still care about, but you broke up because he was a neat nick and you are a slob? There are a lot of people that I wouldn't trust to take care of my mother, or my goldfish, but I'd like to think someone I cared about enough to consider a bf/gf would be someone who's mostly trustworthy and caring. Just all depends on why they are an ex.