It's easy to 'hide behind' the everyday routine and daily grind when you have fallen out of love with someone, we often tell ourselves 'we're tired' 'we're working too hard' 'We need a holiday' etc.
But when we finally go on that holiday, hoping we will feel close again, that we'll feel relaxed and in love and the spark will return etc. It hits us like a ton of bricks that the relationship is, in fact, over.
I think this is what happened here, you're happy and affectionate, legs wrapped around him in the pool, enjoying spending time together and expecting intimacy, and he finally has to face the truth that he doesn't feel the same.
He's acted on it immediately, and blurted out what he's been 'mulling over' for a while, instead of waiting till the holiday is over. He thinks he's done the right thing and he's relieved, he has actually been cowardly and very insensitive about it.
If you continue to stay on holiday (9 days did you say!?) this will be a long and drawn out painful break up, things are going to get said and it's going to be very messy. Why don't you take the suitcase and your dignity and find yourself alternative accommodation, tell him you'll meet him back at the airport for the flight home.