Red Flag.... talk it out with him and I mean TALK it out.  If he doesn't make eye contact with you ask him why he's avoiding it.  Ask him straight out are you lying to me?  and if he avoids a direct yes or no answer keep pushing don't let him squirm out of answering you.

Listen to your gut.

OOPs sorry I am new to this site and I do see your age....even more reason to act quickly!

You didn't say how old you or your boyfriend are so I am going to guess you are fairly young. I  had a similar experience wuth my first husband. He was into pornographic material. He would tell me he quit and downplay the use but he never quit. Eventually I met someone and had an affair. If I had to do it again I would have given him an ultimatum: We go to counseling and give him a deadline or I am out of the relationship. It may seem harsh to set your foot down like that but you need to think about you.In my situation I didn't see how harmful pornography was but he really was cheating on me. Life is too short and it can be very difficult to draw a line in the sand but do it and you will see either he loves you enough to go or he doesn't. My husband and I went to counseling after I decided to end the marriage and even though he wanted to work things out I was in to a new relationship and didn't want to work things out. It was a shame because we really had a good marriage except for the sex. I did see after counseling that some things about our relationship was not healthy but it was tpp late for us. I hope this helps. I just wouldn't waste my life in unhappy situations again.