In astrological tradition, the Venus governs love, beauty, values, and what is found pleasurable, while Libra is a air sign read as fair-minded, diplomatic, aesthetic, and partnership-oriented.
So Venus in Libra is often read as a placement where how affection is given and what feels worth having takes on a fair-minded, diplomatic quality. Tradition holds that someone with this placement tends to draws toward connection and harmony in a way that feels aesthetic — coloured by the air-sign temperament of Libra rather than by any single rule.
None of this is a prediction or a fixed trait. These are tendencies astrologers have long associated with Venus in Libra, and how they actually show up depends on the rest of the chart — the houses, the aspects, and the other placements that this guide cannot see.
A general guide to astrological tradition — tendencies, not predictions. It describes the placement in the abstract and is not about any specific person.