Is seeking forgiveness from the wronged person sufficient to clear one's conscience, without informing them of the reason for the injustice, knowing the seriousness of not absolving oneself of injustices on the Day of Judgment?

Congratulations on your repentance and forgiveness. As for what happened regarding the forbidden habit, it should not be mentioned to anyone, and one must conceal oneself, as the Hadith states: "Whoever commits any of these abominable deeds should conceal himself with the concealment of Allah." Forgiving your colleague is sufficient to absolve yourself from him, and we hope for safety from losing good deeds. One must open a new page with Allah, fill their time with acts of obedience, and stay away from anything that leads to sins, such as bad company and looking at forbidden things. Be keen on the companionship of the pious, as the Hadith states: "A man is on the religion of his intimate friend, so let each of you look at whom he befriends."