Why did I receive a birthday text from ex-girlfriend after no contact?

jt14621
So basically me and my ex girlfriend broke up about 7 weeks ago and it ended badly the typical name calling and what not. After things ended I decided that I was not going to contact her and try to move on with my life. Well about a week ago it was my birthday and I received a text from my ex just wishing me a happy birthday and hope I had fun on a trip that me and my friends were taken for my birthday. She knew about the trip before we broke up. Anyways I really don't get it because I can still feel the pain of her breaking up with me and the nasty things she said. I simple replied "Thank you" to the text and forgot about it. I didn't expect a response which I didn't get but I can't help but wonder why I got a text after all the drama of the break up. Just want some perspective on this. thanks
Why did I receive a birthday text from ex-girlfriend after no contact?
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