A co-worker and I have been seemingly getting closer and closer to one another. She's a good bit younger than me but we get along really well. At lunch we talk about topics that shouldn't be discussed at work and sometimes I'll pick up the tab to be nice. Other times she'll offer to buy me a coffee while I'm busy with work related issues. She has occasionally called my personal cell to chat or to get together for lunch or coffee. A few times she grabbed my hand when we were out at lunch walking to the restaurant. Kissing has never occurred but a few times it almost did happen. I need some opinions on this situation.