I suspect your opinion is formed on the basis of opinions of some people that simply do not have any understanding of the actual legal facts on the ground in either country. Your mentioning of Texas for example suggests that you have an opinion that Texas has a legal right to secede from US - a fairly common misconception about that particular state held in certain strata of society. It does not in fact have such a right, as it would be unconstitutional, as states do not have a legal right to secede from USA, unlike member countries of United Kingdom. In fact the only way it could possibly do that, is to have a pan-US vote on the issue, which would be very difficult to organise, and would almost certainly result in a rejection.
As a point of comparison, Scotland is setting a referendum in a few years, and all it needs for approval is majority of the residents of Scotland - rest of the Union has no say.
There are similar differences in legal, financial, linguistic, cultural and other aspects of society.
Crown dependencies are on the other hand not members of the Union, so they obviously don't count in the first place. Not certain why you chose to drag them into this.