The words "wouldn't" and "don't" are part of some words that are used to indicate "urgency" in these types of sentences. So depending on how strongly you feel about about not living with Bob, you will choose the correct one. For example: "As much as I like Bob, I wouldn't want to live with him"

The way that you have to think of it in the "wouldn't" example, is that it isn't something that is "on the table." The situation is hypothetical. Nobody asked you to live with him. You just know he would be a horrible roommate. For the "don't" example, it is in the near future that you will have to live with this guy, and you don't want to. "Won't" is not going to happen soon, but eventually will. When that time comes, you will not(won't) want to live with him.

Won't also refers to rhe future but doesn't sound that great

Don't means right now that you don't want to live with him

Wouldn't means you would never want to live with him