Geeeze Loueeze girl.. this is unhealthy. He is sleeping with a gay man and wants to sleep with you too? The health risks with that alone would send me out of there.... and how well do you know his Gay lover? Nothing against being gay.. it is just relationships ought to be between two people, not a few people!
Can you move to a different place and get on with your life? That is my suggestion although you will do what you will do in your own time frame. Just don't waste your life for too long on an abusive addict who doesn't care for you.
You are worth WAY too much for that.
As to the dreams.. I have dreams too and they can be realistic, but you get to wake up from dreams and be glad they are over. You get too hitched into this guy and you will be living in that nightmare and not as easily able to wake up and have it is over.
Sorry you are going through all this.