Poor Cathy. Charles shared with her 'sifilis', and so La Keroualle suffered it.When she came in England she was contrariated by the behaviour of her husband(she had a strong personnality after all) but she resigned.
The main political reason of this marriage was the renforcement of alliances between england and Portugal, for the restauration of Braganza House was very recent and was in war with Spain. Commerce had too his importance for Portugal would export oporto wines and england, her manufactures in the portuguese colonies.