sucking sucks

So today I was going down on my bf. Before I explain let me tell you he always tells me how good I am or whatever and Ive believed it until recently. Today in the midst of it all I looked up and he was on his phone!!! Like I won't suck your dick if your gonna be on your phone. Thought maybe he was recording me and I was ok w that I'm up for anything, nope Facebook. I asked him if it was that boring and why he was on his phone and he shrugged the rest of the night he looked rlly sad and I was almost in tears bc he was so sad I asked him about it, and also bc I felt like I should be given attention when I am doing something like that for someone. What should I do???? Please answer I need advice😭😭 I love this guy too and I can't believe he would do this. Am I over reacting?