Why aren't some people able to stay committed in a relationship?

Here's my current scene. I know someone who wanders. Meaning he's in a relationship but talks to other people. He flirts a lot. He's never cheated (from my knowledge) but he flirts a ton. He's flirted with me before, too. And he's been like this with every person he's with. He can't seem to stay focused on his partner. Why is that?
Why aren't some people able to stay committed in a relationship?
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