She's unhappy about the money he spends on it, the time he spends on it, and that he has two bikes (though that might be the money). It's possible that the money is a real issue and/or he doesn't let her spend money and/or any number of other issues.

But it really does make me think she's just unhappy and hard to be around. I say, don't force yourself to ride a bike if that's not what you want, but find something that you like to do and DO it. Don't just sit and be resentful that your partner does.