Why did she go to another bed ?

Why did she go to another bed? At camp Me and this girl was going to have sex while we were alone in the cabin, but just before we should do it one of her friends got back and went to bed at the tionde next to ours. So we decided we should just go to sleep, but after one hour she got up and went to sleep in another bed, why did she Do this ? Kinda hurt my feelings. Asked by Jo