Is true love exist?

I was in an 7-year-long relationship. We were madly in love (or so I thought). She came to my house every day; my parents loved her like a daughter. We got engaged on November 24, 2023, and we were supposed to be married on March 22, 2024. But at the beginning of 2024, she and her family didn't want the marriage to happen. So they decided to cut off all forms of communication with us. I went crazy, crying my lungs out every day. I even went to her house, crying and begging her parents, saying I just wanted to know the reason behind it, but they never told me. And on, May 5, 2024, I saw her holding hands with a guy, and I felt my soul leaving my body seeing her with someone else. How long does it take to move on from this? I can't live with this pain anymore. Sometimes, I just want to end my life and see if I am happier after death. How can people be so heartless?