In short, Leo's 2 endings are unsatisfactory if you're a big fan of the Leo × chase chip because regardless of your choices Leo will be taken by hysteria and from there everything that was built between them starts to fall apart like a old house
This is obviously lies. Chase and Leo get a flat together. Chase changes his major and becomes a novelist and Leo goes back to college and gains a qualification in electric car maintenance. Leo opens his own mechanic shop outside of echo and them and all their family and friends vow never to return to Echo ever again. Echo's dam malfunctions and floods the town.