Is my boyfriend unfaithful?

I have been dating my boyfriend for almost 2 years. I found a large article in his house this weekend titled “How to meet and have sexual relationships with beautiful women.” This article came from a website and he printed it (over 25 pages) stapled together with a old work e-mail as a cover so it would not be found. When I confronted him about it he sent me a long email that stated that he printed it out to take on a recent flight. He said he was embarrassed about it but felt that because he is not cheating I shouldn’t be so bothered. He also said that he wanted to read it because he is has an “inate curiosity to find out about the psychology of men and women.” I am having a hard time believing this explanation. Please advise. I feel sick inside and really don’t know what to do.

huney I’m sorry to say but hes lying men always lie when they get caught up in something i would be more worried about if hes talking to any girls or where hes going when hes not with you.