Libra is the sign of partnership, therefore is committed in a partnership. Libra also needs to feel that the partnership is magical and romantic and special and filled with what I might call, "Champagne bubbles".
In other words this should be a quality of excitement or a quality that is unusual and special and light filled. I go into this because once a partner of a Libran begins to destroy the romance of it, and romance doesn't only mean affection.
Romance means little gifts, surprises, something tucked under the pillow, bringing home a rose, bringing home a special bottle of wine because it's a special occasion like the two and one-half years since you first met.
Libra also thrives on flattery and being appreciated, more than appreciation though. The Libra needs to feel flattered, "Oh, you look beautiful tonight, oh, you have wonderful taste in this or that". If you
take away all of that, you're taking away the romance.
Anything you do to diminish the sense of being in a great romance will quickly have a Libran looking for someone else.