42% of marriages in the UK end in divorce:
The main reasons are cited (from a legal site) are:
Top 10 Reasons for Divorce in the UK
Adultery – Whether this is used on a divorce petition or not, affairs are often one of the main reasons why a relationship can breakdown. The Office of National Statistics show that adultery is only stated in 14% of divorce petitions, it can be hard to prove if the other partner will not admit it. Therefore, adultery is a factor in many more divorces that the statistics suggest.
Drifted Apart – Many couples don't notice that as the years go by, they move further apart. They may find that they just don't have anything that binds them together anymore and could find themselves in separate bedrooms or spending much of their lives separately.
Money Problems – Money worries can put a big strain on a marriage. In fact, there was a surge of divorces in 2010 which coincided with the aftermath of the financial crisis and recession. If one partner is spending excessive amounts or getting into debt, the other may not want to continue the marriage as a result.
Abuse – Physical or mental abuse in a marriage can cause irreparable damage.
Addiction – There are many things to be addicted to in this day and age. Whether it is alcohol, drugs, gambling or other addictions, they can have a serious impact on a marriage and on family life. Addiction can be linked to many other of the top 10 reasons for divorce, such as money problems, unhappiness, abuse and communication issues.
Different Parenting Ideas – Most couples have no idea of the difference of opinions that can arise once they have children. This can cause real conflict in a marriage, and could even result in the end of the marriage.
Appearance – People change throughout their life and this may be an old cliché, but some divorces happen as a result of changes in appearance; whether this is putting on weight or looking older.
Unhappiness – This can be a driving factor in divorce. Many people take the view that life is short and you should not waste time in an unhappy marriage. Life together at the beginning can be great, but once the everyday reality of your life together sinks in, your happiness, or lack of, could be a reason to get a divorce.
Cultural Issues – Some cultures directly conflict with each other and this can cause tension in a marriage. Love seems to conquer all at the beginning but issues caused by culture or religion may quickly stack up.
Communication Issues – Communication is the basis of all good relationships and if there is a lack of communication in a marriage this can cause frustration and ill feeling.
Relationship breakdown for unmarried couples is higher. So I suppose that we have a 50/50 chance of it working out. No idea what the stats are for additional people continuing to stay in unhappy relationships.
IMHO it’s good to be informed - to know the risks and benefits and make your own decisions. Also to know that kind and respectful behaviours are the basics of any RS - with friends, colleagues, children, parents as well as what coercive control (sexually, emotionally and financially) looks like early on so that you can make choices before you are in too deep.
OP - there is no such thing as “too fussy” - you have your own unique needs, wants, standards, boundaries - which may or may not be flexible. Sounds like you have created a stable, safe, busy, social and aspirational life for you and your DCs single handedly. That’s to be applauded and protected.