Is it permissible to hack a Facebook account to find out the truth of a conversation between the suitor and his ex-girlfriend, in order to avoid doubt or injustice?

It is impermissible to steal a girl's account and view her private information without her permission. This action is not justified for the purpose of verifying the suitor's sincerity. The suitor erred by informing him of what happened to him. To move past this matter, one can inquire about the suitor from trustworthy individuals. If he is righteous, then so be it; otherwise, the engagement can be dissolved, with the obligation to treat him as a stranger until the marriage contract is concluded.