Girls I am broken

My husband that I’ve know for 11 years, has cheated on me again. It’s this lady he’s been messaging on and off through our relationship. She’s married as well. I just don’t know why he keeps doing this. I’m so lost, and then he tries to switch it on me and tells me I’m crazy and he denies everything. We have a 1 year old daughter.. I want to leave him but I have no where to go. I can’t go to my mothers house or my brothers house. I don’t know what to do. He’s the only one working since I stay home with our baby. I need advice