Selfish sex

So, I've been officially dating my boyfriend for roughly 2 months now, but we've been together for 7 months. We have sex All. The. Time. It's awesome, but lately, my boyfriend hasn't been eating me out. And it's legit pissing me off because he KNOWS it's the only thing that makes me orgasm. When we have sex, he doesn't take time to go slow, and make me orgasmn. So we had to move to eating me out. But now he straight up whines about it, and refuses to do it. Resulting in huge arguments. Before sex, I ALWAYS give him head, whenever he asks for it, I'll give it to him. No hesitation. I know it makes him happy, and it's a part of foreplay. Whenever we have sex, he always has his orgasmn and he pulls out.  I just think it's unfair. I don't know what to say to him about it anymore.i get to upset about it. I feel like it's so selfish.  How am I suppose to get him to understand that, I too, deserve an orgasm? How does one get their boyfriend to eat them out again?! HELP BEFORE I EXPLODE.