I'll start near the end of your questions.
- Why didn't we break up before we got engaged?
Because we dated for only about 3 months before we got engaged, but the engagement itself lasted around 17 months. Why did I propose so soon? Basically I am not a happy person. Early in my life my primary emotional experience was with negative emotions, so much so that I developed an extremely unemotional approach to life as a coping mechanism. When my ex-fiancee and I started dating, I felt happy with another person for the first time in my life. I was so enthralled by this that I asked her to marry me, with the expectation that a long engagement would give us time to identify and solve problems in our relationship. I recognize that this was the real error in all of this. I should never have proposed when I did.
- Why do I think we would not have been happy if we did marry?
As much as communication was a hallmark of our relationship, compromise was a consistent failing. We never learned to approach a problem and develop a mutually agreeable solution. Instead, and this was primarily motivated by her (in my opinion), we would "agree to disagree" until one of us gave in and just went with the option the other preferred. Typically that meant me giving up and doing what she wanted.
That failure to compromise played itself out throughout our relationship. At its simplest we couldn't agree on simple things like restaurants and what to do on the weekends. At its most difficult we had resolve critical differences such as religion, child rearing, and relationships with one another's families.
- Why was I unhappy?
I felt like she didn't respect my needs or feelings. A lot of that feeling came from this "agree to disagree" phenomena. Frequently, when I brought up a concern about our relationship, she and I would discuss the matter until we were blue in the face without coming close to resolving the issue. Eventually, I would stop bringing up the matter, because I'd rather enjoy her company than have relationship conversations without end. I believe that this contributed to her belief that everything was just fine. She seldom brought up issues because she was getting her way most of the time. And I was unwilling to continue bringing up issues ad infinitum because, realistically, we needed to have some good experiences to make our relationship worthwhile and they were not going to happen while we kept up those types of conversations.
- Why did I break up / Why then?
Don't get me wrong. We did have some success. In fact, after a very difficult series of conversations in January/February that lasted more than 5 weeks, we saw a lot of improvement. But about 3 weeks before the wedding, a week or so before I called it off, something happened that completely undermined my sense that we were improving as a couple. To describe it would take some time. But basically, until that moment I thought we were doing pretty well, and would make it as a couple. But after that event, I was no longer confident in our ability to address our issues effectively. And without the hope that we would eventually resolve our problems, I became deeply uncomfortable with the idea of entering into a marriage.