Just putting down few thoughts. What if I didn't bring the best of H when we were together? One of my friends was telling that maybe OW is helping H to be a better dad. I felt hurt by what she said as H is doing a lot more with kids now we are separated than when we were together. So maybe my friend is right, maybe this OW has a good influence on him.

I remember that when we had SD with us I'd never get involved with how he was discipline her, nor have I ever told him what to do with her. I have always felt that it was a relationship that H should have with her and it wasn't my place to tell him
when to see her, how often etc . I have never offered to take her on holidays with us ( when H and I got married, her mother only told us 4 days before the wedding that she was allowed to fly but her mother put a lot of conditions). So I have never really pushed H to take her on holidays with us as I felt her mum would have created such a problem that it wasn't worth all the headache.

I have to admit I didn't know how to deal with her as I didn't have any kids on my own and as H was so spiteful about SD's mum I didn't feel at ease around SD. So I'm just wondering if all this also might have contributed to H detaching from me a long time ago. I can't undo the past now I wish I hadn't been so naive and have learnt a lot more about life back then!