What is the expiation for someone who made a covenant with Allah to stop watching pornography after recovering from depression, and then doubted whether this covenant was broken?

God's covenant is considered an oath and a vow if its maker commits to an act of obedience or abstains from a forbidden act. Watching pornography is forbidden in Islamic law. If you made a covenant with God to stop watching it, and then broke that covenant, you must offer sincere repentance for watching it, in addition to an expiation for breaking the oath.