So me and my partner recently split up. He moved out and we had 50/50, my daughter from another relationship lives her dad (due to PND) which is under control now. My sons behaviour has gradually gotten worse, he lashes out. He swears, he screams, he's nearly 5. When my older daughter comes he keeps attacking her and getting angry if he doesn't get his own way. This resulted in my daughter not wanting to stay when he was here. So I brought this up with his dad and he suggested he stayed with him. My son has always been a daddy's boy, he always has been since he's been born. When we first split up he would come to mine all day then as it was getting near bedtime he would want his dad. I agreed to him stying with his dad. I feel like a shit mum, like a failure