Do you think my husband wants to be with her?

I love my husband so much but I'm afraid he's going to leave me to be with this other woman. We were having a lot of problems and instead of working it out, like an adult, I had an affair with a male friend. I eventually told him and he left for a few months but came back. He was still not over the affair so I thought it would only be fair for him to get revenge for what I had done and he slept with a co-worker. She's now 8 months pregnant and claiming he's the father. I hope he's not but we know there's a possibly and we'll be getting a DNA test after the birth. Ever since we found out, he's been obsessed with this woman and her baby. It just pisses me off that he's always texting her of talking to her. This was supposed to be a night of revenge, not an 18 year tragedy. I'm afraid he's falling in love with her and I just want her out of our lives regardless of the test results. Help?