I'm a father who will never see his daughter grow up

This is my first time on this sub. The whole thing started with a breakup and after trying to work things out despite her not wanting to, she told me everything regarding her 2 year old daughter. Then I learned that I'm not the biological father of my daughter. I was extremely heartbroken to see her cry to me about how she didn't trust me, and how she resented me for not suspecting anything despite the daughter being completely different like me. <br><br>I was in denial for a while, I couldn't believe it, and now I'm learning to accept reality. It hurts to think that I had to see her grow up, spend time with her, see her first steps, and when I thought she'd call me daddy, but she calls me her other name instead. It hurts to think about it and I think about it a lot. It feels like it's just me with this burden and I have nobody to talk to. I really don't know why I wrote this but I guess I felt the need to express this.