Forgotten Birthday

What would you do if your significant other forgot your birthday while pregnant? Two years in a row at that? Would it be serious enough for you to leave them? For context, we don’t have any issues.. aren’t arguing & in a good space, he literally will have no excuse except he “forgot” but he remembers everybody else’s birthday .. we’ve been together 6 years now. He didn’t have to remind me of his birthday a few months ago either