That’s what I resolved to do, and yet I found myself in this situation again.
No, you did not resolve if it happened again. And you don’t just find yourself in that position, you put yourself there. No one else, no t the first girl, not the second girl, but you.
That’s a good rule. Sometimes it can be hard to do, though, if both of them simultaneously ask to do something on the same day.
No, one of them had to ask first and if you said yes, then you should have told the second girl no. Unless by simultaneously you mean they were both standing in front of you at the exact same moment, both asking you out at the exact same time.

Since that is highly unlikely, you got yourself in this predicament.
I’ve already kissed the first girl. But I don’t think she’s in a kissing mood, so this shouldn’t be too hard to do for the time being. For the time being. Oh, here you go being a victim of circumstance again?
Now, this is a tricky one. When this happened before, I told one of the girls that I was seeing someone else, and she got mad, because she thought we were exclusive, even though I never told her it was exclusive. And I am guessing you never said that you weren’t either.
Regardless, I think these are good rules to go by. Not easy, (Oh for Pete’s sake… Time to grow up and stop being a victim.)but good rules, nonetheless.