Fast Radio Bursts (FRBs) are mysterious millisecond duration radio transients, and some FRBs repeat. FRBs are highly polarized, indicating that the source is within a strong magnetic field. I hypothesize their origin as Tidal Disruption Events (TDEs) of magnetars by black holes. The TDE releases energy stored in the magnetic field of the magnetar, producing an FRB. Occasionally the magnetar is disrupted into multiple debris chunks, and as individual chunks get consumed, multiple FRBs are produced, forming a repeating FRB. Another process of formation of repeating FRBs is starquakes on magnetars because of tidal forces from black holes. Due to the strong magnetic field of the accretion disk, the FRB is produced in jets. Sometimes the magnetar debris surrounding the magnetic field gets accelerated, producing Ultra-high energy cosmic rays, whose source remains unknown. The FRB signal produced gets polarized by the magnetosphere of the accretion disk and intergalactic magnetic fields.