Am I obligated to pay the bills related to the period of my presence in the project, knowing that my partner exploited the contract written in his name and extorted my share, which harmed me by my departure from the project?

The invoices due at the time the company was operating: each partner must pay his share of them. What the questioner took from the capital and his profit during the partnership period obliges him to pay what is due from him for this period, and his leaving the company does not justify withholding the right that became due from him.