Hello, my dear. You have received a lot of advice from all different vantage points. However, you are the only person who can make this difficult decision. Many people think the term "pro-choice" means having an abortion. It doesn't. It means having to make one of the toughest choices of your life - raising the baby, putting it up for adoption or having an abortion. That is a decision only you can make.
By all means, if you decide to raise the baby yourself, file for child support. He helped make the baby and he should help pay for the things the baby needs. Don't worry about what he will tell his wife. That's not your problem.
If you decide to go for adoption, look into different options with that. You or a family member may have a friend who has been struggling with infertility. You may want to go with an open or a closed adoption. How much contact do you want with the adoptive family? My son is adopted. He is now 23. A family member of his birth mother knew I desperately wanted a child and couldn't have one. We also had an open adoption. His birth mother was always able to call me to check on him or get an updated picture. She and I both know our places in his life and we sincerely appreciate each other to this day. He now has a relationship with his birth siblings. In fact, their children call me Grandma.
Should you take the even harder road of abortion or even consider it, be sure you get counseling from someone who does not judge you for what is an extremely hard personal decision. There are a lot of places that do judge you and, rather than let you work through your options, will try to get you to do what they want you to do.
If you want to talk to me, I'd be happy to talk to you without judgment. I'm not sure if there is a way to click on here to get to me but my email is ____@____.com.