I’m so lost

So had my first relationship just came to end a few weeks ago and I can’t believe whats happened recently. I got into a relationship with this woman when I was 18 (2021) and it recently came to an end and it’s eating me up inside. This is my first heartbreak and I can’t stop thinking about her. We weren’t perfect but we had a bond with each other. She would constantly go back to texting her ex when she would drink and I started talking to other girls after I learned that but we never broke up when we should’ve and stuck with each other. We never physically cheated on each other but we did emotionally I think. Well after we officially broke up she went back to her ex for the night, did the nasty and got pregnant. She told me a couple days ago and it destroyed me. I recently texted her my goodbye text and blocked her but I’m scared I’m gonna unblock her and try to talk to her. I miss her everyday shes my best friend in the world. Told her my mistakes and said I was sorry for everything. I want to learn my mistakes and change for the better