I hate being in a situation where not knowing the truth is going to hurt so much that I don't want…

I hate being in a situation where not knowing the truth is going to hurt so much that I don't want to know but I still want to know at the same time. My child's father moved in with me to help with the baby. We are not in a relationship but we are still intimate although we sleep in separate rooms. He helps me financially but I think he is still seeing his ex.i can just sense it.