Arranged Marriage: She's Distant, Am I Overthinking?

I am 28, will be engaged in 3-4 months. It's an arranged marriage. I have met the girl one time, that too she was accompanied with her parents as her family is very conservative. We spoke privately for about half an hour. I know it's still not enough but I was able to have a good conversation. She was nervous at first but I made her feel comfortable and it was then time well spent. She is a sweet girl, even my maa papa like this girl but on the other hand, I am also getting worried as the days are coming near. Sometimes I feel like postponing the event. Is this normal? I also fear of things that happens in nowadays like getting divorce, extra marital affairs, alimony etc. What if she finds a better partner after marriage? Will she leave me? Due to this I cannot have proper sleep recently. Any suggestions to calm my nerves?

How do I 32M get over my insecurity with 30F? (Seeking Advice) Met this girl via matrimony exactly 2 months back. We connect well. Our families have met recently and it went well. Somehow we found a lot of connections between our families. That's just a bonus. Her family likes me a lot and they wanted to do Roka when they met us last week. I had told her, that no matter our bond, we should talk a lot and give it 3 months before going for roka. We live in different metro cities and have met twice now. About her: She is 30, well behaved & spoken(most important thing for me), smart, good looking, and is extremely polite. She is an army brat, has had a lot of freedom from family. Due to her father's job, they kept getting posted to different cities so she doesn't really understand family part of things. She's in a IT job. About me: I'm 32, okayish guy, in IT. To take things ahead I need to know my partner's past. I have no judgements at all but need to know stuff. Getting to know things over time bothers me a lot. I've tried to work on it, and have always made sure I don't bother the other person too much. After a month of talking, she told me that she had a casual boyfriend for an year. All her friends were dating in Bangalore and she decided to try it out. Found a guy through bumble and started dating him. So, according to her there were no feelings, just a person for her to go to places with, have drinks, and party. She likes drinking a lot and I have never taken a sip. She said that it was just a phase and she was immature. This happened between 2018(Nov) to 2020(march). So, it's been like 5 years. Never dated anyone after that. Since covid(2020) she's been living with her parents due to wfh. I have been completely ok with that but new things surfaced and they are messing with my head. While snooping around her facebook I figured out who that person was and this guy is super close to a person in my distant family. In fact they both were flatmates until their respective marriages. This distant cousin of mine knows me and knows her really well. These 3 used to hangout a lot and he has seen her come to their flat regularly. Infact, she had a good bond with my cousin as well. There are things that bother me and I really can't shake things and feel super awful in my gut. She mentioned that she and her ex had a common love for drinking and regularly visited pubs, got drunk, and partied. This means that they would be staying at each other's place as well. This is something super old but bothers me a lot. Specifically the fact that she would be drunk partying with someone for an year and sleeping with him, with no feelings. Secondly, I found some posts where she has liked a post about this guy on fb/insta from mid-2021. I have already confronted her twice to share everything and we shall never discuss this again but this bothers me a lot. Secondly, now that I know the timelines I can figure out what photos have been taken by her ex. There's even a photo of her sitting on a messy bed, where she's cutting her bday cake. They celebrated it together. I found my cousins page and some other pages from which I knew it's the guy's room/flat. I know everyone has a past. She has come clean to me but somehow my brain is so split. Sometimes her nature and behaviour with me make me not care about anything. And then I know the bed, flat, and her actions with some guy. Then there is this angle where the ex's flatmate is my distant cousin and knows about her well.