Have you commanded it to leave?Cleanse your home and raise the energy level. Declutter and find a reason to laugh often. Ask St. Michael for protection. Shield yourself, your loved ones and your home.
Last remember that you, in a physical form, are stronger than it.
I have no problem with spirits that want to hang around providing they are non threatening and non menacing - exsist and let coexist. However, if you're going to be a jerk then you gotta go.