My Boyfriend’s Addiction To P0rnography Has Made Him Lost Interest In Me – What Should I Do ?

Dear Admin, My boyfriend of six months has suddenly started showing interest in pom magazines, which he buys at secondhand bend-down stalls at bus-stops. He’s also into revolting pornography films and has lost interest in me. He is 27 and I’m 20 and it’s making argue all the time. I’ve refused to watch his stupid movie. 
What should I do?