Gideon's Ex Girlfriends are: Courtney, Riley, Nina, Sloane, Irene, Ginger, and Ramona. While Ramona was never added to Gideon's "collection," the other 6 are kept in a large hanging Cryogenic Freezer inside Chaos Theatre. Gideon's plan was to unthaw them and date them at a time of his choosing, but only when Ramona was frozen amongst them.
Their stories and opinions of Gideon are unknown, though assuming they've been frozen against their will after becoming his ex, they probably think of him some kind of ass.
It is not known when Gideon started "collecting" exes, but Irene claims over the phone to have been frozen since 2003.
All 6 are unfrozen at the end of the series.