I dont want to marry him...

I feel like i dont want to get married to my fiance because he seems to love to look at porn. It bothers me so much!i know some ppl might say its not a big deal but to me it is. I just seen him looking at porn and i totally lost my shit! I told him im not marrying him. The wedding is scheduled for next year...He's a good fiance but i just cant get over the fact that he wants to look at porn..