Unless he's a breakdown mechanic himself, with his own recovery vehicle, then I don't know what you expected him to do? If he drove out to you, he'd likely be breaking the law by stopping his own car on the dual carriageway. And then what? It's not like he could've taken you anywhere as you couldn't leave the car unattended, you had to wait for the AA to arrive.
Maybe he could've (should've) offered to pick you up from the garage after the car was recovered, but did he know you were stranded there? Did you ask him for a lift back?
Yes his responses sound particularly terse the way you've put them, but did he really say all that in that way, or are you just selectively quoting part of a longer conversation? Because it reads very unnatural and one sided to have just spewed all of that response all together in one go. They sound like the sort of comments someone would make in the heated exchange?
And dating someone for a couple of months has a wide range of intensity - that could be anything from having met up a handful of times, to being fully exclusive and spending every spare moment together. If it's more like the former, then maybe it's a bit early to expect him to be your white knight?
But if you're not happy with his behaviour then go ahead and finish it, it's not a big loss with a relatively short relationship. I wouldn't recommend ghosting, but a brief text will be sufficient.