Not sure if this is the correct space for this, but AITAH?

I’m a teacher at a small K-6 public school in a big city. I’ve been here and created my own space for over 3 decades. I’ve seen good teachers and bad teachers come and go. We don’t get a lot of vacancies and historically there have been more due to folks reaching retirement age than people being disgruntled and leaving. 

Recently, we have an opening in a department. We’re looking for someone with a degree/license/background in Earth Science to teach a range of science and possibly math courses. Our education department maintains a website that prospective teachers can post their resumes and schools list their upcoming vacancies. We have yet to post and might wait another month as we are exploring other hiring avenues. Our school is very well known in the city and we will get a lot of applicants eager to work with our population. 

Here’s my issue: I have an acquaintance that hates their school and is looking to exit in June. We’ve known each other before we both got into teaching and while this is my only school, it would be something like their 8th job in 4 different states. Their life has taken them in a different direction, as has mine, as we all make choices in life. When they were in the city, they had issues with the schools that they were in and never really lasted more than 3 or 4 years at any one location. Usually it was someone else’s fault that they didn’t stay, and I only had their version of the issues that they faced and little info. 

Oh! We also used to be in a relationship! Ups and downs, but in the end we weren’t compatible and have stayed in touch at a distance. I was at their wedding, and they’re now divorced and life is what it is. 

Back to the job though. They’re going to see this posting and think they’re the best candidate for the position. They have a advanced degrees in related science/math disciplines that we’re not hiring for. They’ll see the posting and feel as if they have an inside track to the position, because of me. As a senior staff member, I’m on the hiring committee too!  They think they’d love to work at my school, but I’m certain I don’t want to work with them in my last years before retirement. I don’t think they’re a good fit as I feel that they think they’re always the smartest person in the room. 

Should I just contact and tell them about the opening and that I don’t think it’s right for them? Or let them see it when it posts, allow them to apply and then speak to them about why we won’t hire them? AITA for either scenario? Ugh.....