My boyfriend watches porn while getting head

So I've noticed recently that my bf "secretly" watches porn on his phone while I give him blowjobs. I don't think he knows that I know he does this. It bothers me because I am a bigger girl and it makes me feel like he doesn't find me attractive in that way and because if his attention isn't on me them it feels pointless for me to be doing it. Im not saying i should be the center of attention, but if he's just gonna stare at his phone, whats the point in giving him a blowjob? Should I feel this way or am I just over reacting?