If i forget to confess a sin and later remember them, does it mean i have not been absolved? Do i need a fresh confession or am i good?
No, you do not need a “fresh confession”, you have already been absolved. If they’re venial sins, it is not mandatory to confess them even though the Church exhorts us to, if they’re mortal sins, we MUST confess them. However, if after going for confession with adequate preparation, and you really intended to confess a particular mortal sin but your memory failed you, do not worry, God already forgave it. However, it is wholesome to mention it in your next confession, but be rest assured your sins are forgiven and you’re in the State of Grace again.
Before going for confession, remember to prepare by praying, meditating on the Word of God (preferably the commandments, and Christ’s teachings on sin), and also reflecting on your actions to know where you’ve faltered. Doing this will help condition your mind for a real sacramental encounter with the forgiving Lord and the celebration of your continued conversion. If you prepare well, and develop the habit of regular confession, you’ll grow faster in the Spirit.
God bless you!