Why did my ex wish me a happy Birthday?

Me and my ex had a really bad breakup. After months he sent me a text to make peace on his end. I was to pissed to accept it at the moment. Time went on and I decided to get over it and send the same text. He calls me and to tell me he’s seeing someone and to ease off? Which was totally uncalled for because I wasn’t trying to be with him. My birthday comes and he sends a happy birthday text. But you just told me I couldn’t text you, but you text me.
Why did my ex wish me a happy Birthday?
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