Yes; Allah opens Sūrah al-Māʾidah by commanding the believers to fulfill their contracts, and elsewhere states that every covenant will be questioned about on the Day of Judgment. The Prophet ﷺ listed breaking a promise and betraying a trust among the signs of a hypocrite, alongside lying when speaking. This obligation binds Muslims in their dealings with everyone, Muslim and non-Muslim alike, since treachery (ghadr) is condemned absolutely and the Prophet ﷺ warned that every traitor will have a banner raised for him on the Day of Resurrection.
Evidence — the daleel
On deen2u
Informational, not a personal fatwa. Consult a qualified scholar for rulings on your situation.