Maybe it's not about choosing one over the other just because that's what is expected. Maybe the doubts you're having about your UK boyfriend are simply about knowing it's time to move on. Not every relationship is meant to last forever. There's nothing wrong with breaking up with someone if the relationship isn't working as well as you'd like.
The world opens up... when you do.
Oh, oh, can't you see? Love is the drug for me. ~Bryan Ferry
"Love is that condition in which another person's happiness is essential to your own." ~Robert Heinlein