I want an adult to tell this kid "Look, this is your first relationship, get over it and move on"
Seriously. Them dating wasn't a problem. It was that bat shit crazy mother of hers. In reality if your love has a crazy family its either they remove themselves from said family or you remove yourself from them. Considering she is so young and still living with family, your only outcome is to break up. Or boring giant tits moves out and gets a job.