Let's talk about girls!

[Angrist]

Ok I have a weird story again. There are these twins that I met yesterday. They're both cute (although 4 years older than me).
Problem A:
Although I can tell them apart (by looks and somewhat by behavior), I can't remember who of the two I told what. I started talking with one, but then later more with the other. Very confusing.
Problem B:
I liked the first one, who was a bit more chaotic than the other. But at the end of the night the other said something that could be a hint. So... I feel like I got the attention of 2 almost identical girls. How do I react to that?

PS: This is the possible hint that the other one gave. Our group of 6 people was cheek-kissing goodbye. After the girl and me did that, she kept standing in front of me for a second and told me (with a serious face): 'I had a great time' (freely translated from Dutch). She didn't tell anyone else that. Possible hint?