@TheCoralTurtle
I completely get you. I used to be in a job some 15 plus years ago - where there was an office manager (male) about five years older than me, who was always trying to poke his nose into my private affairs, and my marriage. Trying to find out why me and DH were selling a car and buying one 4 years older. 'Do you need the money? Are you broke?' Tried to find out why we were having another baby so soon after the last. 'Was it an accident?' 'Was it planned?!' 
And when DH walked off 10 feet in front of me when he picked me up from work one day - the next day he asked what's wrong in our marriage! Nothing. DH was just going ahead to unlock the car and move the shopping off the passenger seat so I could get in. So fucking unbelievably nosey!
And I've met more people like that in the workplace and also in my neighbourhood. About a decade ago, this one particular woman moved into my village and I met her at a village hobby group.. She wanted to know every aspect of my private life. 'Why do you work part time?' 'Why do you only rent your home?' (which we did then!) 'why isn't your husband higher up in the company seeing as he's been there 10 years?!' (Because he really likes being in lower management and doesn't want to go up any further and have more responsibilities!) 'Why is your daughter doing a masters? Does she not want to actually work?!' (Cheeky cunt.) Just sooo many intrusive questions about things that were FUCK-ALL to do with her! (Often with a side order of rudeness, sarcasm,, and bitchiness!)
And when we were at the pub with her and her DP, she was asking intrusive questions about my DH's family, and my DH said he doesn't speak to his brother anymore, and hasn't for over a decade. BIG mistake! She just wouldn't stop going on about it! I was fuming with him for telling her this. All he had to say is they don't see each other much when she kept asking about him!
DH said he is a horrible, misogynistic controlling bully. (Think Charlie from Classic Corrie... Just like him.) DH said that he is dead to him, and that's all he is going to say about him.
She stared at me and started demanding to know if he was REALLY like that. I said yes he is and that's the end of the conversation really..'. I must have repeated this 100 times! She said 'yeah but is he really like that...?!' And she kept saying that!
I just said 'yes he is!' and that I really didn't like him either as he's a horrible misogynist who is toxic and controlling, (as DH had said,) and I won't elaborate any more.. She kept saying 'but really if your husband wasn't here what would you say about him though? Do you like him really?' I said 'no, no! I don't.' She just kept grilling me and going on at me and nagging and whining and saying 'yeah but if HE wasn't in the room what would you say?' I said 'I would say the same!' and I was starting to get angry with her goading.
She kept begging the answer to many questions about things that were fuck-all to do with her. Private family stuff, private couple stuff, and private financial information. 'How can you both afford to work part time? I don't get it!' she bleated with her head tilted and a confused look on her face. There is nothing for you to get! It is NOT YOUR BUSINESS!
She became so intense that after a year and a half of tolerating her, I actually ghosted her. She was starting to get me down, and make me feel anxious and stressed. Took a full year to shake her off and I had to drop out of both of my hobby groups in the village. I also lost 2 friends, (in the village, who I made at the hobby group,) as they sided with her as she told them I was a bitch for ghosting her. Like I was the bad guy! Thankfully, she AND the 2 'friends' live a good 15 minutes walk from me, and not too close to me, so I rarely see them!
Another reason I don't divulge my private life to anybody or any personal issues I've got, is because ultimately - when you fall out with that person, they will use it as ammunition to hurt you. I've had it happen and it's fucking horrible.
I tell people NOTHING now. My private life is just that... PRIVATE!