I've tried plant identifying apps and the closest thing is rose moss or some type of stonecrop, but neither of them look right. It has flowered once: the flower appeared within a day, was white with long, thin petals and dried out/withered after a day. The leaves seem to be succulent leaves.

The leaves remind me a little bit of a Monilaria but I wouldn't hazard to say that's it because I'm not super familiar with them (I have only one, and I don't even know the species) but the flower you described could also be it.

Looks to me like it might be a type of Ice Plant. The are several genera, Delosperma is one of the more common.

Agree with Jay

I think it's an ice plant, the leaves and flowers look accurate. Thank you

There are lots of succulents referred to as ice plant. That isn't one I'm familiar with.