Cheating husband but I’m homeless?

My friend is in a situation where she has become homeless. Her best friend is letting her stay at her and her husbands house. The two are never home because they travel for work. Recently the husband has started to text her inappropriate things. My friend doesn’t even reply to the messages but the husband doesn’t get the hint. She doesn’t want to say anything because she doesn’t want to get kicked out. What should she do? Also, there is no where else for her to go so she really needs this situation to work out.