<human>: Give me a shortened version of the text

So my wife and I were high school sweethearts, and long story short, it didn't work out. I'm 26 years old and have never really dated before. Here's what I'm confused about:

The way I imagine this going is, you hang out with someone initially due to mutual attraction, and you get to know each other. But say that I identify some important differences that I know will make "forever" impossible, but we still enjoy the relationship we're having. When/How do you break up?

I'm a very transparent and straightforward person, and I feel like if I realize that it's not going to work in the long run, keeping that to myself would be deception, and I just can't do that. But if I say it out loud, doesn't that just end the relationship, usually? I suppose it matters on what her perspective is, but I'm asking for examples of what might happen/usually happens.
<bot>: What do you do when you realize your SO is not the one for you long term but you still are enjoying the relationship?