Is Hiring PIs In Arranged Marriage Ethical? Shocked 26F Asks For Advice

I (26F) have been in the process of searching suitable prospects through Arranged Marriage Platforms. I had connected well with a match (29M), we have been getting along quite well, chatting, phone calls & even met several times in person, over the last few months & got engaged after both Families liked each other. The Wedding is scheduled early in 2025. After our Engagement, my Fiance came up with a Shocking Revelation. He confessed that he (along with his Family) had Hired a Private Detective to snoop on me for a month or more. The Detective had conducted a thorough background check about me & my Family by secretly snooping around many places such as my Neighborhood, my Alma Mater, my Workplace, my Gym etc. & finally gave the Family a 'Clean Chit' about me & hence they decided to go ahead with the Engagement. I wasn't aware of all this, until my Fiance told me, all by himself, but only after our Engagement. Needless to say, I am Shocked at his Confession as I had always been Honest with him about everything he wanted to know about me, still he had to rely upon the 'Clean Chit' issued by a Stranger to be sure of my Character, while he'd been acting like he Trusted me all the while. He tried to pacify me saying that this is just a part of the usual Procedure & most people are doing the same, these days. But I am not able to Digest it. Even though, he has been repeatedly Reassuring me that he completely Trusts me now, I am afraid that he might continue snooping on me, even after we get Married. I am confused as to whether I should be Trusting my Fiance & going ahead with the Wedding, as scheduled? Or discuss with my Family & Call off the Wedding for what my Fiance had done? Can you please advise me, whether Hiring Private Detectives & snooping on prospects is really a part of Arranged Marriage, these days or my Fiance & his Family have Trust Issues? Is it even Ethical (if not Illegal)? Can I initiate any legal action against them for breaching my (& my Family's) Privacy? How do I deal with this, if he continues being so Suspicious about me, even if we decide to go ahead with the Marriage? P.S: I have been completely Honest with my Fiance, right from the beginning & even I Trusted everything he told me without any Cross-verification. Have I been the Foolish one here, while my Fiance had been playing Smart? Would you advise me to do the same thing, which he did, even though, I do not like the idea of having to spy on Loved ones?