Does This Happen to You?

I would just like to say that I have never done drugs before other than smoked weed for a couple years. But I have been having dreams for years about doing heroin. They are extremely vivid dreams that I have every few months and the dreams stick with me for a long time. They don’t fade away like most dreams do. And it makes me crave heroin so badly but I’ve never even tried it before (unless I was drugged by my abusive ex) so I don’t understand how I can vividly dream about and crave a drug I’ve never had. Does this happen to anyone else? Is this a thing or am I just crazy? Or does this mean that my ex gave me heroin without my knowing?