Sincere regret (nadam) is the very heart of repentance — the Prophet ﷺ said, "Regret is repentance." But genuine regret naturally produces its fruits: immediately abandoning the sin, resolving not to return to it, and restoring people's rights if the sin wronged them. Regret that coexists with continued insistence on the sin is not the true tawbah Allah has commanded.
Evidence — the daleel
On deen2u
Informational, not a personal fatwa. Consult a qualified scholar for rulings on your situation.