Recently I slept with a girl after two "dates" - by dates I mean hanging out with her and her friends at bars and their apartment. She's one of a group of girls on holiday.
I built up a lot of comfort and rapport between us.

During the foreplay (which lasted about 2 damn hours!) I encountered strong last-minute resistance.

Anyway, I eventually got through the LMR. We had sex, pretty hardcore.

She's been weirdly cold and distant ever since. Before, she was replying to texts instantly. Now she was ignoring them.

Eventually she wrote a quick text to me - but only to pass on a message one of the other girls had for me. (She damaged her phone I think)

Anyway. I texted her earlier and said we could hang out one last time tomorrow (before she goes back home), but she said "I don't think I can, I'll probably be busy - but meet up with the other girls and have fun!"

Does she think I'm using her to fuck her again? Or is it buyer's remorse, or what?

What can I do to prevent this happening again. I always want to leave a girl feeling better for having met me.

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The “Four Fs” are the four basic drives that animals (including humans) are evolutionarily adapted to be good at: fighting, fleeing, feeding, and reproduction.