Would you leave your current girlfriend for your ex?

A bit of a rough spot on this one. I have a crush on someone at the moment but also still have left over feelings for my ex even after they cheated on me. I know for sure that if we were to get back together, things wouldn't pan out very well. Say they were to ask me to be together again, I'd say no but I mean, I'd still think about it. It sucks having your trust be broken.