Why am I so niave

Why am I so weak? My boyfriend always flirt with and talk to other girls. He sells them dreams and treat them better then he treats and talk to them better than he does me. I almost was attacked catching the bus to get my son from school while he sat at home playing his game. But recently he was concerned about another girl and her kids and them being out in the cold winter without a car. But me and you're child was out in the dark... You didn't care