Still not speaking

My brother messaged me last Friday and I have not replied. I can’t bring myself to return his pleasantries and it just feels false. I’m still struggling to reconcile his decision to abandon his child in favour of his woman. Maybe I should give him an opportunity to explain. But I feel as though it doesn’t matter what he has to say. I’m just not interested. I’ve managed years without him in my life. Do I need him in my life now?