Girlfriend broke up with me because I'm too serious. Is this fair?

Is this fair and valid reason? She told me I don't like to have fun and all I do is complain about my job.
I mean, it's true that I don't like my job and I'm looking for a new one.

But why would she break up with me for that? I don't understand.
Girlfriend broke up with me because I'm too serious. Is this fair?
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