I recently came across an astrologer saying that 7L in 8H is a sure shot sign of being cheated on.
My question is can such a statement be made on the basis of a single placement?
This is indeed a general interpretation.
For ex, 7th lord Saturn in 8th can mean dead bedroom and spouse won't be interested in sexual pleasure sat all or sexual compatibility can be -1. Still, this is general.
Example 2, 7th lord Venus in 8th can mean that the native can be cheated on by partners due to their low standards/ poor choices/ not wanting to be alone. Sometimes, the affair can be emotional.
Example 3, 7th lord Jupiter in 8th can mean that the native can seek "variety" in sexual pleasures and it's hard to be with one until a certain age. Not necessarily cheating. They could be faithful to spouse after marriage, depending on other placements.
Example 4, 7th lord Mars in 8th can mean a physically violent spouse or sexual abuse in some charts. In some cases, simply means wild/cave man sex. Here, cheating can be a one-night stand or just sexting online. Entire chart can tell a different story.
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