Went from divorced to happily remarried

My first marriage ended when my oldest was 3. Spent years thinking I'd destroyed my kids' lives and that I was a failure as a dad. Barely saw him some weeks because I was so depressed. Met my now-wife 4 years ago and it changed everything. Now I have my kids every other week in a house that actually feels happy. They have a stepmom who loves them like her own. My oldest is actually excited when I pick him up instead of seeming sad. I miss having my own place and the simplicity of being alone sometimes. But I'd never go back to that dark place for anything. Being a better partner made me a better dad.