What am I doing wrong ?

So on Valentine’s Day, I thought me and my boyfriend are gonna have cute, romantic sex or whatever right??? WRONG.

He told me he wasn’t in the mood, which I was perfectly ok with, so today I had to use his phone to look some stuff up and when I was looking at the history to go back to the other page, I saw porn from last night... Why would he tell me he wasn’t in the mood, but go watch multiple porn videos? I find that very rude and disrespectful... am I over reacting or what?