No you weren't naive, you were in love and believed that his love was strong enough for you to take a different path. Like someone wise here told me a leopard can't change his spots.

How do I know that? I saw H behaving nastily towards his ex- partner, and I thought that with me (because I was the complete opposite of her) it would never happened. Guess what I'm getting the same treatment as his ex, and you know what I realise that he is the ONE with issues not me.

I know it hurts because you would have never in a million year thought that this would happen, the problem is him not you. Keep going forward.