Just bear in mind hentaywee that 50% of all marriages in the U.S. end in divorce, and that number jumps to 67% for second marriages. I have been married for 24 years, and I have watched this unfold with so many families.
So I am not certain that there is a huge correlation between your own situation, and that of the norm group. Obviously many people find out rapidly that they held rosy views of marriage, and didn't really know what they were signing up for. That's why church groups mandate Pre-Cana courses before automatically tying the knot for people; because of what you described, and because of that huge statistic.
Mania most certainly can and does put a stressor on a marriage, but if you have the love and support of a genuine partner, it can of course be overcome. As you would advise anybody, in a relationship take it nice and slow, and don't jump rashly into anything before you know that person. IMO.