porn...??!!??

So my boyfriend and I have been together for 6 years our sex life is amazing. He works on the road now and he's home on weekends I recently started working nights and it's kicking my butt I'm tired all the time trying to adjust... He had a little over two weeks off work for the holidays. The other night I was extremely tired and didn't want to have sex and I fell asleep the next day I went on his phone to look something up online and he was watching porn while I was asleep!!! I asked him about it and he told me not to get mad if I'm "snooping" and that I should have just had sex. I freaked out hid his phone and we argued for hours I told him a few months ago I don't care if he watches it when he is out at work but not when he's home with me. So now when we have sex I always think that he wants somebody younger but I'm only 21 and he's 29 so how much younger could he want?! Was I wrong for getting mad?!