How to discuss porn with boyfriend?

I am in a long distance relationship and recently mentioned the issue of porn to my boyfriend. For me it's not a big deal at all, as long as it doesn't affect us, or the way we feel about each other. He never really admitted to watching it, but I know he does. Last night, on accident, I stumbled across a profile he has on a porn site. Normally I wouldn't care, except he lied to me and said he couldn't talk last night because he was tired and fell asleep for awhile. He was really logged into this site. I feel weird about the whole thing and a little betrayed. It makes me wonder how many times he has lied to me. I know if I bring this up, it's not going to end well, but I sort of want to just for my own sanity. I always try very hard to do little things to let him know how much I love him, especially since we are so far away, but it's stuff like this that makes me feel so not wanted or special to him. Am I being weird and is this something I should just let go? Thanks for your help!