My ex tried to stop the divorce proceedings but he went about it the wrong way. He threatened me and told me things like "you'll never find anyone better than me" and "you'll be lonely without me and one day you'll die alone". I went through with the divorce anyway and never looked back. I moved out of our home and had to get a job for the first time since my son's birth. I got full custody of our son and he only has weekends. From the beginning of our split my ex criticized me and tried turning my own child against me. It got out of control when he got word that I started dating. That's when he would question our son about my whereabouts and once he found out I was engaged to another man 2 years after the divorce he went a little crazy.     

He told my son I was a terrible mother and he was going to take me to court to get custody because I was an unfit mother. My son told me that his dad said I was a no good sl*t and now that I had a new man in my life I wouldn't care about him anymore. My wedding is in July and my son was supposed to walk me down the aisle but my ex filled his head with nonsense and now he refuses to even be at the wedding. The funny thing is my fiancee and son like each other and they get along quite good. 

It gets worse. My ex-husband is turning our son against me with each passing day. Just recently my son said he now wants to live with his dad instead of me. I don't know how to handle this situation anymore. I feel his dad is a bad influence but if I try to keep them apart the more he's going to be drawn to him. I want my son to be happy but I'm not sure living with his father is the right decision.

What can I do or say to make sure my ex doesn't destroy the relationship between my son and I? I need answers! PLEASE.