Need advice

I'm a girl, 14 and I recently broke up with my ex-girlfriend. I and her meet through Instagram and then it turned out we live in the same town and we started talking even more. She confessed her love to me and I accepted it even though she was going too fast. It was all going ok. She was texting, and so was I until she broke up with me. I didn't quite understand why and she did that and I was only thinking about it. 24/7. One day I just wrote her a paragraph and told her everything I felt. Turned out, she broke up with me because her best friend was tired of her only being with me texting with me, etc, and she felt left out so she broke up with me. We started talking for 2 weeks and everything was ok, until valentines day. I prepared everything. I brought her a plushie and a homemade gift I did when we met up, she gave me candy and flowers and i was happy with that. Until she called her best friend and asked her to join us after asking me if I was ok with that. Of course, I said yes but deep down I didn't want her to come. She did, and I was quite quiet and started talking instead of being awkward when she told me about her story where she and her bff and her other bff did a test in which one of her best friends and she were a perfect sex partner match. I got super sad and she noticed it. But I let that slide, I got super mad when I saw how she put on her Instagram messages how she was looking for hot b**** to text with. I knew it was a joke but I got sad and I posted a story of how I felt like she didn't like me anymore. And she said that wasn't true and showed me all the people she texts with, what she texts with them etc. I thought I was overdramatic and stuff especially when we didn't talk for 2 days and I asked her if she was mad at me, and she left me on seen I started sending messages in which im really mad about her doing this and all she did was leave me on seen. I found out later why her mother had cancer but that's a different story. I apologized since I said a lot of awful things and she APOLOGIZED instead. I felt terrible. A bit later, i noticed we were drifting away and barely talked. When I lost feelings and I felt that she was as well, i texted her i needed a break. later on, broke up with her, and now we are passing each other by today while i was eating for my friend to finish eating, I noticed she was looking at me without saying anything and just whispering to her friend while looking at me. Should I text her, or do I seem pathetic?