How to stop forgiving my ex?

My ex is constantly playing me making me feel like shit, but I still love her so i always forgive her

Context we were best friends for 2 years then dated for 3 we got engaged and it ended because she cheated this was like 2 months ago don't have many other people in my life

Example she asked me what to wear to go fuck her new boyfriend and then sent me a picture of the outfit knowing it bothers me and told me he was great it made me feel sick but I forgave her
How to stop forgiving my ex?
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