I want 2 be with my boyfriend but his getting an arranged marriage?

my boyfriend has secretly loved me for 5 years and now were togther its been almost 1 yr n a half we are 2 different religions his muslim im christian we know our parents wont really accept but we said we would do anything to be with eachother his parents suprised him the other day telling him he has2 go overseas 2 get married next WKKKK and his grandma is dying and requested 2 c him get married before she dies he wants 2 c her but not get married he told them about us and they are viloent he is now scared of them but our love is like no other he isnt like any guy iv eva met and i will neva let go as we will still be friends but my heart is bleeding for him we want 2 be togther but he is scared 2 escape as he only has 1 wk, he has given me a tempory engament ring a few months ago and told his parents but they dont care what should we do??