Boyfriend is blackmailing me to marry him family is not allowing

i m in a relationship for 13 yrs,i am a Muslim girl & he is a Hindu. we love each other. But my parents fixes my marriage to somewhere and they are forcing me to accept the marriage proposal. on the other hand my Bf is forcing me not to accept the marriage and marry with him only(Bf), and he is saying that he will show our photos and videos to the boy (groom) and his family that we took while having sex with our consents. even i had sent him many nude pics and mgs from my mail and whatsapp, as we both were ready to marry each other. But due to family pressure i cant marry him now.