Definitely not. Eddie and Venom have a complex, mutually beneficial partnership, but it's not a romantic relationship. It's based on mutual dependence for their own purposes rather than love.
In the search results provided, he did not find any information related to funny husband and wife abuse novels. I don't know the answer to this question.
It depends on the specific comic run and the creative direction taken. In some versions, they have a romantic relationship, while in others, they might just be close friends.