Sorry but I disagree with many of the replies.
When men tell you they don't want relationships, for fucks sake - Listen to them. And when they say they don't want a relationship right now, sorry but that means 'I don't want a relationship with you, ever'. 99.9% of the time.
No matter what ifs and buts they tag on after that.
That asside, what do YOU want?
Why are you going on a trip with a guy you want a relationship with when he had told you he.does.not.want.a.relationship. Why are you settling for being a bit of fun if thats not what you want?
You are, presumably also having sex? Well, it's all on his terms isn't it! Why would he bother with a relationship if he gets everything he needs from you whilst remaining footloose and fancy free!
I'm sorry but, he's really just not that into you. It doesn't matter a flying fig if you'd be good together or not. Frankly, for someone who's known you years...he doesn't seem to respect you much. Infact, you don't even respect you.
Infact, I'd give him more benefit of the doubt though as he has sorta spelled it out to you. It's just, you clearly don't speak man.
The 'I'm not sure what I want' is always, always your cue to say 'that's alright, that's for your time , cheery bye/let's just remain friends then'. Unless you too, are looking for a fwb relationship (at best) or (at worst) to be dicked around.
He's not just scared. Hes not 5 fucking years old. He's a grown man. Stop infantalising him and treating him like he doesn't understand his own mind.
He's telling you no. Listen.