Short answer. No. Article 1614 lets a co-owner who sold only their own share, separately from the others, exercise the right of repurchase independently as to that share alone. The buyer cannot compel you to redeem the whole property just because the sale involved an undivided immovable.
What the law says
Each one of the co-owners of an undivided immovable who may have sold his share separately, may independently exercise the right of repurchase as regards his own share, and the vendee cannot compel him to redeem the whole property.
Civil Code, Article 1614 — Co-Owner Selling His Share Separately. Read the full provision →
Your repurchase right is independent, tied only to your share
Article 1614 addresses exactly this scenario for co-owned property. It provides that each one of the co-owners of an undivided immovable who may have sold his share separately, may independently exercise the right of repurchase as regards his own share, and the vendee cannot compel him to redeem the whole property. Because you sold only your own undivided share, separately from your co-owners, your right to repurchase is limited to, and fully usable for, that same share alone, regardless of what your co-owners choose to do with theirs.
The buyer cannot bundle the whole property into your redemption
The article specifically blocks the buyer from forcing a broader outcome. Even though the property as a whole remains undivided and co-owned, and even if your co-owners never sold or never redeem their own shares, the buyer cannot condition your right to repurchase your share on also buying back the shares belonging to others, or otherwise treat your redemption as incomplete unless the entire property is redeemed at once.
Why the law separates each co-owner's transaction
Each co-owner has an independent, undivided interest in the property, and selling that interest with right to repurchase is treated as its own separate transaction between you and the buyer, distinct from whatever your co-owners did with theirs. Letting the buyer force you to redeem the entire property, including shares you never sold and interests that belong to other people, would tie your rights to decisions made by co-owners you may have no control over, which the article is designed to prevent.
What this means when you exercise your right to repurchase
You can proceed to repurchase your own share on its own terms, based on what you originally sold and for the price and conditions attached to that specific sale, without needing your co-owners to act at the same time, and without the buyer being able to insist that redemption only counts if it covers the whole undivided property. Once you redeem, you recover exactly the share you sold, no more and no less, and the property remains co-owned in whatever proportions the other shares were never disturbed by your separate transaction.