How do I send the "we should probably talk about what happened last night" text?

Last night, after a fairly prolonged period of flirting, I went to a concert with a girl I dated briefly a year ago. After the concert she went back to my place. We made out a whole bunch and cuddled, it didn’t go further than that per mutual comfort levels.

Backstory—we were a thing in late August, broke up mid September, and got back together a few weeks later. That time it lasted like a week, and we broke up again. It was our first year in college, relationships are shortlived and weird, we got over it. We’ve both seen other people since, and retained a friendship with each other.

Anyway, though, last night was really nice. But even though we did the same stuff as last night this morning before she had to leave for work, stuff was definitely awkward, and texts between me and her today have been sort of stiff.

What do I say in a text? How do I proceed? I don’t want to sound like I’m upset about what happened, or overly eager to pursue things—neither is really true. I just want to know what she wants out of this and stuff. Given the way she’s been in the past, I don’t honestly trust her much to stick around. She seems to have changed, who knows. But if she hasn’t changed, I’d like things to end more on my terms than they have in the past.