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He seems to making a joke out of the situation in which Mrs Bennet is taking very serious.
Mr Bennet does not spend much time with his wife he usually spends his time sitting by himself in his study. "I will be glad to have the library to myself as soon as maybe."
From this I get the impression that Mr Bennet does not want to spend very much time with his wife.
I think he seems sarcastic and quite cocky towards his wife. Think this as in chapter one when Mrs Bennet is trying to persuade Mr Bennet to go and visit the newly arrived Mr Bingley, Mr Bennet replied, "I see no occasion for that. You and the girls may go, or send them by themselves.....for you are as handsome as any of them, Mr Bingley might like you the best."
I find this statement very insulting towards Mrs Bennet. Although this marriage may seem very unsuccessful in the time we are living in, it was a typical marriage at that time and would have been considered successful as it was based upon money and not love or respect.