Sounds like you had a bad experience. Sorry and too bad.
But that doesn’t mean the same thing will happen to everyone else.
They sound like two smart, young people who plan to go through life together.
Bitter, as you are, there may even be something good out there for you too.
Lighten up.
I base this on statistics and the experiences of many couples I personally know.
I honstly wish it wasn’t this way but it is and I live in reality. Divorce is a 60+ billon a year industry in the usa and it crushes an enormous number of perfectly fine men.