Confused

Has anyone ever had an long distance relationship well just an hr apart in my situation and you'll see each other every weekend and maybe 2 times during the week day. Then you move in together and you see stuff with the person you never seen before and you just don't want to be around him at all. Thats my situation we been together for 5yrs and I can't deal with this at all... It's very mentally draining to me and if I knew that he was like this I wouldn't if never moved out my apartment. He always lying about something thats so childish to lie about. Once he took my car while I was sleeping. So I sleep in another room and hide my car keys too. My kids want to get away from him too. They see how he changed too. I'm so tired of fussing and always being in a bad mood one he comes in from work... Have anyone dealt with this before? What was your outcome? I don't have family in the state I live in and there really no help either... Thanks you guys