Husband involved in a haraam relationship

I am a revert Muslim and have been married for 6 years. Its been 6 months that my husband is seeing another girl and recently moved in with her a month ago. He comes home now and then just for an hour or so and keeps telling me his coming home and that he loves me. Please help me. The night I caught him with the girl, he was hiding behind the door. When I got him behind the door he laughed at me and I was so shocked Ya Allah his body was there but the head on the body was not his that just smiled at me. I am sad, heart broken and have two kids and don't know what to do. Please guide me and let me know what I can recite to bring him back home. This is not my husband the way he is now, he was a house person and always had time for his family and kids. We love him and miss him a lot. I believe with what I saw on his body that something like black magic has been done to him to keep him away from his family. Please help me.