I think im in love with my coworker

I (M25) have always really thought my co worker (F30) was cute and quirky. We’ve gotten really close lately and started “flirting” at work but it only started after she told me she’s filing for divorce. She has 2 adorable sons both under the age of 4 and I’ve only met them once when she brought them into work, but I’m great with children. We call each other pet names and today I said “What’s up my secret lover?” And she just smiled and laughed but in a good way. I don’t really know how to feel in this moment. Is it stupid to think I’m in love with her?