I agree with the sentiments expressed by Weby and bookgrl--I think it's more the idea of being in love with an Englishman, and being whisked off to England than this particular bloke that's appealing to you. Of course I don't know *exactly* what you want, but you keep saying how you only want to date Englishmen, and are fascinated with England, but really nothing about what this guy has that you're into.
It may very well be he got scared off, or got in deeper than he wanted to. Some people think LDRs are okay, and that they can handle them until they're actually in the middle of one, then the stress becomes too much. If he really wanted to make this work, he'd put in a little bit more effort--when I was Stateside, my husband would get up a bit earlier in the mornings before he went to work so he could talk to me before I went to bed. We didn't even discuss marriage until 2 or 3 years in, after I had visited the UK a couple of times, when we felt ready to take that next step. Like you, it was the only way I was going to go to the UK on a permanent basis, but I didn't make a big deal of it in the beginning--we took it step by step, visit by visit, and it just 'worked'. Maybe it was too much too soon for this bloke and he can't take it anymore, but doesn't want to be a jerk about it either.
But, if he really doesn't want to be in a LDR with you, he needs to be honest--not mean, but honest. If you still want to go to the UK, treat it like a regular trip; book your own hotel, see your own sights, and if you two want to meet up a few times just to talk you can. That way, if you hit it off in person, awesome--if not, at least you got a cool holiday out of it. With that said, if you have your heart set on Englishmen, then you're going to be *forced* into LDR, which often have their own unique set of complications and dramas, and this might be something that repeats itself in the future if you continue to date Englishmen exclusively.
And really, Englishmen are no different than American men--they have a posh accent, may use different lingo and such, but really it's just down to the individual guy. You might be happier if you open up your options a bit, I bet you could find some awesome guys Stateside (and the English traits of an Englishman certainly won't make up for some major faults they may have--a posh accent doesn't make up for a guy being a jerk, for example).
Either go visit the UK and treat it as a holiday and see where things go, or you might just have to cut off the strings a bit. If he's not willing to make it work, or at least be honest with you and let you move on, you have to make the decision for him and not waste your time