"What has happened has happened ~ it is in the past..."
We all sin continually. We slip and fall. In reality, we fall into a trap set by the demons.
The Holy Fathers and the Saints always tell us, “It is important to get up immediately after a fall and to keep on walking toward God”. Even if we fall a hundred times a day, it does not matter; we must get up and go on walking toward God without looking back.
What has happened has happened – it is in the past. Just keep on going, all the while asking for help from God.