I get that. You’re a good guy. But 

1. It’s her child. I know you’re attached and child is probably too. But keep that in mind. She found a guy who clearly took to her kid and loved the kid as his own. That’s not easy. And **she willingly threw that away**. She should have been kissing the ground you walk on. It’s hard to find a good dad to a kid who’s not your own. 

2. You gave her a ton of opportunities. She didn’t care.  **Why wasn’t the child her concern** too? After all, it is HER child.