toying with
1. To treat (someone) without due seriousness, especially in a superficially amorous way.
2. Consider (an idea, movement, proposal, etc) casually or indecisively.

3. Move or handle an object absentmindedly or eat something in an unenthusiastic or restrained way.
1. You: Are you even trying?
Me: Not really.
You: Then stop toying with me. It's just cruel.
2. J.K. Rowling toyed with the idea of writing a book.
3. She was toying with her food.