I'm very confused, too. Lois acts like she's single. Clearly she wants a relationship with Clark and is goading (not sure it's the right word) him into more-than-friendship direction. She doesn't live with Matymbou. He isn't step-father to her son. She isn't step-mother to his daughter. Why is he considered her husband? Why doesn't she explain to Clark her real status quo?

She should realize she is sending mixed signals to him and this is not good when he is so fragile and lost.

He is being very open with her, she should reciprocate it if she wants to earn his trust.
Andreia