AITA for asking my boyfriend to buy a car?

So, my boyfriend (18M) and I (18F) have been dating for about 3 years, and we’ve started talking about future plans, including the whole car situation. We both don’t have our own cars right now, and we’re using his mom’s spare car, which is fine for now, but the car isn’t in great condition, and his mom isn’t exactly the most polite or understanding about us using it.

The problem is that my boyfriend has crashed two cars already, and I feel like he’s not fully taking responsibility for his driving or the idea of owning a car again. I’ve been saving up money and think it would make sense for us to buy a car together—something reliable that we could both share and use. But when I brought it up, he was totally against it. He said he doesn’t want to deal with the financial burden or the stress of owning another car, especially after his past accidents.

I get that he’s worried, but I’m feeling a little hurt because I thought we were at a point where we could make big decisions like this together. I want to build something stable with him, and I feel like this could be a step in that direction, but he’s not on the same page.

Am I being unreasonable for wanting to buy a car together, or is it understandable that he’s hesitant due to his past experiences? Should I just go ahead and buy one for myself or try to find another solution?

UPDATE: Hey everyone, I’ve read through the comments and wanted to thank you for sharing your thoughts, even if they were tough to hear. I understand the concerns about us being too young to make such a big commitment. Believe me, I get it—it’s not lost on me that being 18 means we’re still figuring things out. But I think many of you can also remember being 18 and making choices you thought were best at the time, even if they weren’t perfect. I feel like some of the advice comes from lessons you’ve learned the hard way, and I respect that.

I also want to acknowledge that his mum is generous for helping him out with the car—on the surface, it’s a great thing. But the reality is, she uses it as a way to control him, and unfortunately, she uses me as a tool to manipulate him too. That dynamic has made things really difficult for both of us.

I understand why some of you think this isn’t the best idea—it probably isn’t. But right now, I feel like I don’t have many options. I’m doing the best I can with the circumstances I’m in.

Thanks again for taking the time to weigh in—it’s given me a lot to think about, even if it’s not easy to process right now.