What does it mean if you are with 2 guys and 2 girls and one of the girls asks only you to stay with the other one and the others leave?

We were on a tour, I was entering an old abandoned place, 2 girls that I know saw me passing by and told me to come with them, they wanted to go on the tour with me. During the tour, 2 guys joined us. When we were in a dark part, one of the two girls got scared and grabbed my arm very tightly, pressing her head against my body. When we got out of there, the girl that wasn't scared told me: "Hey, stay with my friend (the scared girl), we're going to continue with the tour."
What does it mean if you are with 2 guys and 2 girls and one of the girls asks only you to stay with the other one and the others leave?
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