Great question — answering as the UphillTech team:
You're describing the exact plot of Therese Raquin by Emile Zola. There were many adaptaions of it, but if it's in English & from the 80s, you might be after the 1980 mini-series with Brian Cox. There was also a recent adaptation (2013) with Elizabeth Olsen and Jessica Lange that was called In Secret . Here are some clips starring Alan Rickman from the mini-series:
Full answer by Walt: https://movies.stackexchange.com/a/32596 (CC BY-SA 3.0).
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