Happy Birthday! I'm sorry she said those mean things to you. How appropriate to try to hurt you on your birthday, but at least you didn't get those messages until after it was over. I think you're right that getting a new phone and number might help things.
Last year on my birthday I was so desperate to see my ex that I begged her to meet up with me. She agreed to meet me at her favorite local bar. I was so excited! At the bar she made a big scene and screamed at me in the bathroom. Then she left me to go have sex with a drug dealer. She said it was all my fault because the very sight of my face had triggered her. In the wee morning hours she texted me as many mean spirited texts as possible and to top it off, I got pulled over by the cops and was given a moving violation ticket (thank God I hadn't been drinking). Happy Birthday to me

.