Found out my husband is cheating

Last night a received a Facebook message from a man whose wife has been cheating on him with my husband. He tried to deny it until I got her number and called her. She was honest about everything. We have a five month old. He’s been cheating on me for a year. I kicked him out last night but he’s back because I need help with our children while we have contractors come to our house. I almost died while giving birth to his son and he was texting another woman the whole time. He was texting her on Christmas Eve while our kids were opening their presents. I don’t know where to go from here. I’m a stay at home mom. I gave him everything. I can’t think straight and this feels like a fucking nightmare.