I'm going to take a monitoring job that my gf wanted
Why are you taking the job meant for your girlfriend?
I'm thinking of working there because I can be strict with the kids.
That's good you want to work, but this is where your partner is going to shine, not you. You are overshadowing her and making her feel insignificant by stealing the job she wants. Find a different one.
It's none of your business.
It seems really weird you would want to take her job if you are not even interested in the first place. Don't you think she might feel hurt if you get it?