cheating husband?

I’m 13 weeks pregnant with our 3rd child and I stumbled across some email that my husband had sent 2 of his exgirlfriends. They were flirting very heavily and making suggestions that they needed to meet up sometime. So, I guess its not exactly cheating but planning on it…? I don’t know what to do. His family and I have been close up to this point but now they are defending him and I have had it so I let them know what I think about them. I told my husband that I would just get an abortion so that we could get divorced but I could never really do it. I just don’t want to have to go the same road we did last time when we were separated when our youngest was a baby. We were in and out of court and hating each other the whole time. I just don’t want to put another child through that…. What should I do?
We live in Texas and its against the law to get divorced while the wife is pregnant.