Me (23M)and my GF (24F) likes to keep me on edge I like it too but it is getting difficult for me to make the difference when she’s keeping me on edge or being serious

So it all began last year (2022) in December I met my now girlfriend she enjoys keeping me on edge since the day we met she likes to see me pursue her and I love trying getting over her little games she planned to keep me on edge but because I’m so good at her games she makes them more and more unpredictable I wont be telling her little games in detail since they require really personal stuff so far I have only failed to realize she was playing one of her little games on me twice right now at time of writing this (3rd march 2023) most recently she said stuff like she is fed up of me (not going in detail, personal) and me getting really sad since I thought she was really fed up of me I am planning to come up with a safeword to make me realize she is keeping me on edge so far things are going great except these minor problems

So I’m looking for advice how to communicate this properly with her and some onions on this and how I should proceed after talking with her