HouseSitter (1992)

Newton Davis builds his dream house and presents it to Becky with a proposal of marriage. She turns him down. He leaves the house, still with a ribbon around it and returns to the city, smitten with Becky. He meets Gwen, who has an interesting relationship with the truth. He spends the night with her, but leaves while she is sleeping.

She takes his description of the house, searches it out, and moves in. The residents of Newton's hometown become curious and Gwen invents a marriage, a courtship, and and an entire history. Newton's parents meet Gwen and are immediately taken with her. By the time Newton finds out, the whole town thinks he's married, and Becky tells him that Gwen has made her see him in a whole new light. Gwen and Newton agree that she can pretend to be his wife and get free rent while Newton works on Becky until they can announce a divorce. The trouble is that nobody in the town wants them to separate and they keep trying to help them reconcile.