pregnant and divorced

I caught my husband of 5 years messaging an escort service! I am 7 months pregnant and we have a 3 yr old son, I am going to talk to a lawyer this week to figure out the next step, for now I am staying at our house and he is going to have to stay somewhere else. I have never felt so deceived in my life :( i know I need to be strong for both of my sons but it's so hard.