Break Up & Divorce

She said "We don't click anymore." What does she mean?

OK, my brother's girlfriend just broke it off and told him "We don't click anymore."

Here's my brother's description of the situation:
"She seemed more distant and her job tore us apart with different shifts. Now she doesn't have that job, but she's been sick and we've not been able to see each other for two weeks. I tried so hard to make her feel loved or make her smile when she seemed to be distant. She said she still loves and cares about me, but we just don't click. I can't help but feel like we could work again since she dosn't have an opposite schedule."

They were great together and I want to help my brother put together how she's feeling. I prefer girls' responses, but guys, if you've figured this out before, any input would be appreciated. Thanks for the help.
She said "We don't click anymore." What does she mean?
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