Hi shoemad!
I agree with funky (hi funky!). If it's eating you up, you should try and talk to them about it and put your mind at rest.
My mum and dad divorced when I was 13 and she soon married my step-dad who treated me really badly, this ended up affecting our relationship seriously. It's only recently (8 years on), now they have divorced, that we have talked about how things were and how we both felt- it's helped me a LOT!
Obviously the circumstances are completely different, but it will help to talk about it. It sounds like you've done a great job though, don't beat yourself up, hun.
xxx :o)