What is the ruling on mixing and friendship between the sexes and the limits of collegiality, and is a suitor's jealousy over his fiancée regarding impermissible mixing considered an interference with her freedom?

It is not permissible for a man and a non-mahram woman to mix freely or be in seclusion, due to the corrupting consequences that result from it. Islam has preserved society and protected women from the causes of corruption and places of suspicion. The questioner is not advised to marry this woman as long as she insists on being lenient in mixing with men and does not adhere to the Sharia regulations.