Everyone seems to be mentioning "fear", but I want to say it's "lack of confidence". Maybe he's in to deep, or maybe he's sensitive to her needs and decides that maybe she doesn't like him as much as she used to? Perhaps he's been in a relationship similar to this one before and was burned by it?
I have a character who's quite different, but is going through a similar thing: he's afraid to get close to anyone, other than his best friend. It turns out that he had been engaged to a woman but she ran off with another man (that or she died, not sure which yet, though I'm leaning with the first one).
The trick is to flesh out your character. Ask questions, pry into his life, inquire about past and current friends and family. Once you can get inside your MC's brain, you can find just about any piece of info you want. OR you could make it a mystery that the woman must find out why he's ending the relationship so quickly -- and thus change the genre of your script. (Just what kind of job does your MC hold? Is it secretive or classified? Does he have a deeper secret that he's afraid will be exposed and drive her away?
The choice is up to you. Good luck!
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"Either a writer doesn't want to talk about his work, or he talks about it more than you want."
- Anatole Broyard
"Get it down. Take chances. It may be bad, but it's the only way you can do anything really good."
- William Faulkner
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