Would my brother even be in the wrong for breaking up with his girlfriend?

So my brother is 28, and his girlfriend is 30. They've been together for a year. A few months ago my brother moved to a town 3 hours away to be with her, and they are renting out a really nice house. Well my brother called me a few days ago and was saying he was feeling very guilty because he feels the honeymoon face has worn off, and he's thinking of breaking up with her. I essentially just told him that he can't help how he feels, and that he shouldn't feel all that guilty. He's in a particularly tough spot because he got his job through his girlfriend, and his boss knows her. Also she made a big deal about their one year anniversary, and everyone ones like "aawww you guys are such a good couple!", and im sure my brother saw it. I texted him and asked how he's doing. He usually responds right away, but he hasn't responded, and im worried.

Would my brother even be in the wrong for breaking up with his girlfriend?
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