You sound like you resent him for not wanting the same things that you do.
Is there a compromise here?
He doesn't seem to want a change. You want some major changes - to move house is a big change, even if you don't move far, and buying a caravan is a big decision too.
I'd consider where your requirement for a big change is coming from. Is it just general unhappiness? Is there a specific reason that you want a caravan, or a new house? Are you deliberately, but subconsciously, choosing things that you know he won't want to do?
Is there anything you do both want? Anything you can try together? If you can't find something in common, you're going to struggle with this resentment. It doesn't sound like it's a good idea to make a big change feeling like this, so you're kind of in a catch-22.
I'd think carefully about why you want to move. In the meantime, I'd speak to him, or email him if you can't speak to him, and explain that you are finding life stale and want to enjoy things with him, but you're finding his negative attitude draining. Ask him to identify something that he's excited about doing with you, and give a clear deadline - next Friday, for example. Keep the email neutral, so he doesn't feel attacked. Don't nag him about what you're doing, or if he's booked anything. Just let him do something.
If he does nothing, then you need a bigger discussion, because he'll be deliberately ignoring your feelings. If he does something, though, you'll be doing something together and it'll be a start. Small steps.