I (28F) ended up in tears because my significant other (26M) forgot to get me a birthday gift. How would you respond in this situation?

Last Friday was my birthday, and my significant other had been working night shifts, finishing at 6 AM. When he came home, he wished me a happy birthday, and we chatted briefly before he had to run some errands and sleep, which I totally understand after a long night. I jokingly remarked, "Make sure you get a birthday card," thinking he would have already picked one up. He went straight to bed and woke up around 4 PM while I continued working from home. I had to step out to run some errands before heading to my mom's for the night since we had plans for the morning. When I returned home, there was still no sign of a card or anything. I went ahead and bought my own birthday cake because I wasn’t about to let my birthday pass without one. Yesterday, I brought this up after waiting to see if he would do something, and when he didn’t, I finally said something. He explained that he was really tired and forgot to get anything. I’ve always considered myself low maintenance; I prefer gifts with meaning over expensive ones. But I wonder if I’ve given the impression that I don’t want anything at all. I pointed out that he could have at least grabbed a cheap card or some flowers, and he responded, "You have flowers in your vase," even though they were practically dead—something anyone can see since we live together. To make matters worse, a little over a month ago, I started a new job, and when he attended a party, he didn’t wish me good luck beforehand or even afterward until I brought it up. I’ve always been laid-back, and now I’m starting to wonder if that leads people to think they don’t need to put in any effort. I’ve cried for two days over this situation. It's not about the gift itself; it's the thought behind it that matters. Adding to my feelings, my friend, who is two days younger than me, mentioned how her partner made her feel special, which made me feel even worse. And here I am, crying all over again.