My ex ran many tests before breaking up with me. It hurt a lot even after so much time. How can I trust someone again?

In the last two weeks, she introduced me to her friends and family. Asked for their opinions. Talked about kids and if I want to adopt, tested my jealousy by telling specific sex stories. Asked me what I will do after I graduate. We dated for nearly a year and she started acting strange. She was really avoidant towards the end and barely had any empathy. Before the breakup she said I’m the most important person in her world and loves me so much. During the breakup couldn’t even reply and did it over text. How do I trust someone ever again?