How to deal with a delicate situation with my nanny and stbxh

My stbxh (48m) and I (38f) are in the middle of a divorce. We’re nesting bc my kids are really small and we’d prefer to not have them rotating back and forth.

My stbxh was a SAHD and now got a job working overnights. We have a nanny 3 days a week to bring our daughter to school and to watch our son on the days after he does overnights. My stbxh relieves her after picking up our daughter from school.

Our nanny is about 26, cute and used to work as a bottle girl in high end clubs (very much my stbxh’s type). I hired her, I pay her and do all the coordination with her.

I never was able to uncover the full extent of the thoughts that went on inside my stbxh’s head but I have some cause to believe he’s a bit creepy. He thinks every woman wants to sleep with him. This makes for a dangerous combination.

I try to never talk badly about my stbxh to the nanny because I don’t want to involve her in our BS. Today, I told her that he was going to be coming by in the morning now (on his insistence) to bring my daughter to school. Her face dropped a little and she was like “why??” And I was like I have no idea, he’s an oddball and won’t listen when I told him no.

She seemed to take this opportunity to share things with me, and she said something along the lines of “yea, he’s very…. Uh I kind of just don’t even listen half the time when he’s talking then try and run out of the door.” Then she was like “idk I guess he just seems lonely. And sad.” She then said he was asking her a couple of weeks ago if she knew where I went over the weekend (bc I went away). She said she told him she didn’t know (which she didn’t) and told me her loyalty was to me, I was the one paying her check and made some comment about how she’s a woman too, she knows how it is. I apologized and said I was sorry he was making things awkward and putting her in the middle of things, and we kind of left it at that.

He’s been coming to the house more when she’s there. He went to walk the dog last week and is now doing the whole drive my daughter to school thing. I’m worried he’s trying to move in on her. I don’t want to call him out bc I don’t want him to say something to her and make her even more uncomfortable. I also can’t let this continue. How would you handle this?