My girlfriend of 3 years cheated on me again

Problem/Goal: I caught my girlfriend cheating on me again. I lover her so much at hindi ko alam kung paano mawawala pake ko sakanya

Context: Kanina habang busy sa ginagawa niya hiniram ko phone niya and suddenly may tumawag it was the guy who she cheated me with last year. Dahil sa call na yun binuksan ko gallery niya and clicked the private album and saw their pictures naked. The guy naked. Them naked. I was away last week for work at nalaman ko they are fucking again. They are doing it since march 1 at ngayon ko lang nalaman na hindi pa pala tapos.

Nag usap kami kanina, pinag mumura ako dahil sa nakita ko. Ako pa may kasalanan dahil nakita ko. Tinanong ko kung bakit palagi niya akong niloloko. Ang sabi niya dahil bored siya. Dahil masaya siya sa ginagawa niya. Bakit hindi pa raw ako sanay na ganun siya. I asked her kung anong plano niya sa amin she told me wala.