What were your reasons for being unhappy?
I have such a bleak view of marriage. I am financially trapped in a verbally abusive, loveless marriage at the moment. I should have known better than to marry - everyone in my family is either divorced, unhappily married after adultery (but they stayed together anyway) or together for practical reasons despite not liking the person very much.
I think marriage is the kiss of death for a relationship (although mine wasn't great before either). But with others, it seems the cracks appear after marriage.
I won't deny I have changed and grown over our relationship too, and we want different things out of life. But I find him an unbearable person to live with now, I'm walking on egg shells every waking hour. I haven't had a fun day for years, I'm just surviving.