A lot of the people commenting on whether OP should still marry her fiancé are missing or ignoring a basic fact about situations like this:
Most men do stuff like this all the time. Most (straight) men act like this with their partners. Most men believe that this is an appropriate way to treat their female partners. Most men have been taught or decided for themselves that a woman's feelings about a situation like this should not be taken seriously, let alone followed.
Some are not like this, but the vast majority are.
Women do not marry men like this one because they want to be treated like this. They get married because they want to be in a conventional relationship and family. And they marry men like this because that is what is out there.
"Do you want to live your life being told you’re overly dramatic? Do you want to be with someone who minimises your fears? Do you want to continually be told that your feelings don’t matter?"
If all women regarded their options in this way, there would be very few marriages, long-term heterosexual relationships or traditional nuclear families.
You might think that this is a good thing. But you should acknowledge, when you talk about OP's relationship in these terms, what you're actually advocating: lesbianism, single parenthood, or celibacy. Again, nothing wrong with those choices. But don't imply or suggest that she should drop her current partner but is likely to find another man whose outlook will be completely different.
There are only so many men who meet the standards being implied here (even though the standards of basic decency and consideration of one's life partner are not very high).