Go with your friend.

I'm sorry to say, I think you likely have been catfished. Either that or he's got cold feet, possibly because he isn't exactly who he's made himself out to be. Even facetime and seeing his social media isn't adequate to fully know a person.

Forget this dude. If he wanted to, he would.

Give yourself a fantastic vacation. Have fun with your friend. Pack in a bunch of awesome activities and make sure you go home with good memories.