I have my ex boyfriend living in my home. I pay for everything from rent to the electric bill that is in his name.

My ex and I broke up a month ago. I have asked him multiple times to leave. He refuses to leave. I pay all the bills and needs for everyone in the household. I have three kids by him. He doesn't do anything around the house to help out the household. He is an alcoholic and a drug addict. I've told him multiple times to stop drinking in front of our kids and stop doing drugs in my home. I have a paper written stating that he would've been out by January 6th of this year. We decided to try to work things out on a few stipulations. He hasn't followed one of the stipulations. He brought a gun in my home that is not registered to him without my authority. I've told him to get it out. I even have pictures of the gun to where the ammo is low enough to where the kids can get to. I just want him to leave because he is not responsible and doesn't put forth any effort to help me besides to watch the kids while im at work at night. Someone help. Please.