Starting a New Relationship Quickly After a Long-Term Relationship

I had a 7-year relationship (from age 15 to 22) with my now ex-partner. We broke up in mid-December, and by mid-January, she was already in a new relationship. Just days before I found out about her new partner, we had agreed to take a year apart for both of us. It’s worth mentioning that she always told me she didn’t find her new partner attractive or appealing. In fact, a week before getting together with him, she told me she wouldn’t be with him. At first, I felt hurt because even her family welcomed him into their home (I used to get along well with her parents, but after the breakup, they held a grudge against me, even though it wasn’t my fault). She constantly posts about how happy she is with her new partner, but she still throws subtle hints at me on social media. Even her Instagram bio has a hidden message directed at me. We’ve been in no contact for a week now, but in our last conversation, she told me she had never felt this way with anyone before, that she had already moved on from me, and other similar things. She even lied about a few things and compared me to him. I had never seen her behave this way before, and more than the breakup itself, it hurts that the person I loved the most for years would treat me like this. I never imagined she would act this way because the image she projected was that of a good, empathetic person with strong values. She was always insecure, jealous, played the victim, and was manipulative. She would get upset if I wanted to hang out with my friends or if I liked my female friends’ Instagram photos. She’s an extremely dependent person with low self-esteem, and that also brings me down because I know she’s being used. At times, I have the clarity to see how toxic she is, but at other times, I miss her. I know she’ll probably reach out to me again because I don’t think her new partner will put up with the things I endured, especially since he likely has other options. I’ve already accepted that she won’t come back, and I don’t want her back in my life, but sometimes I run into her because she lives nearby. Even though it’s only been a month and a half since everything ended, I feel a bit better. I know breakups usually take years to fully heal, but when I found out she was dating someone else and that her family almost rubbed it in my face out of spite, all the feelings of affection and good memories I had went straight to the trash. And with so much disappointment, I care less and less every day. Has anyone else gone through something similar? What was your experience?