my boyfriend is too busy for me, and i don’t know what to do

I have extreme extreme anxiety and some struggles with depression, so I’ve always depended more on my boyfriend than a normal person would. That being said it’s not unhealthy, I can go without him, but I do need to talk to him every day and be physically with him pretty often otherwise I start to get anxiety about our relationship. We’ve been dating for almost two years and he’s always been great about my anxiety, making sure we talk every night and making sure we have at least one day every week to spend with each other. But recently that’s all gone out the window. He doesn’t make time even to talk to me anymore. I’ll text him telling him that i’m feeling down or sad and he will act like he never saw the text. It’s like every time he texts me now it’s to let me know that he’s going to be busy for another five hours. By the time he finally gets to texting me back I’m already asleep. And he doesn’t have any time to spend with me anymore. And i really don’t know what to do. I want to be with someone who I can spend a lot of time with, that’s how I love. But every time I try and talk to him about this he gets angry and defensive and says that he spends all his free time with me. I don’t want to try bringing it up anymore because he just gets so defensive. Last time we argued about this he said i have to accept it or i’ll have to be alone.