I just want a divorce ...

My husband got caught cheating a few months ago ( a 4 year affair) , we have been married for 4 years but together 9 years , I'm 8 months pregnant and have a 5 year old daughter by this piece of shit. I tried to work on my marriage but something is telling me to just get out of it and move on. I think he's still in contact with the woman because he's back "working late" and " money is missing from the safe" ....I called them 8 times to see where he was at because his cousin had a birthday dinner and he said he would drive himself ....so a hour and half pass and he then decides to show up . Soon as you walked up I told him I called him and his respond was " and I ignored you " so he had a attitude with me from the time he showed his face , so I got up and left . I thank god for my kids cause that's the only thing good that came out of this miserable ass relationship but it's time for me to move the fuck on!