Boyfriend issues...

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So today is me and my boyfriends anniversary together (not saying the time period) and we couldn't go out or hang out today like we wanted to, so instead, we spent the day together yesterday. Last night when we were hanging out, he said he would call me in the morning and we could spend time together on FaceTime and on the phone. But I called him today and he said he was busy with his friends, and that he would rather spend time with his friends right now than talk to me. I just feel like today is supposed to be about US, nobody else. Especially because it is our anniversary. I really wanted to be able to talk to him without anyone else getting in the way, because obviously it's annoying, and I want to spend quality time with him today. After we talked on the phone this morning, he promised he would call me later, but he has always said that before many times, and never ended up calling me "later" or calling me back... I want to explain to him that I want to spend time with JUST him today and he should feel the same way about me, because it's quite OUR day today. He always tells me I'm a priority and I'm important, but he always talks to his friends more than he talks to me, and as much as he says I'm his #1 priority, I don't feel important or like a priority at all... I don't know how to tell him that, though. He will end up denying it and getting mad because he says we "always talk 24/7", which we don't. We can't always see each other every day, but obviously we talk on the phone every day. I feel of less importance to him because he has been spending so much time with his friends lately and I feel like he is getting bored of me, so he goes to talk to other people to occupy himself or distract himself from me... it's honestly really annoying and I want to tell him that but I don't know how to say it without sounding like a b*tch or clingy or annoying. He is my boyfriend and I want to be a priority to him as much as he is a priority to me... I just do not think it is fair that he is shutting me out and talking to his friends rather than talk to me... Any advice?