Dislike my SO now

I've been with my SO for over six years. And I guess since everyone found out that I was pregnant. A lot of his past sexual partners have come out and I'm finding out a lot. One of them even claims to have his child yet never told him and she admits to that. We were long distances for over 4 years. Though I do know almost everything about him including sexual partners. I didn't know every little detail until now which most people don't know about their partners past. He is my one and only sexual partner too. We are in our 20s and We are about to have a baby together. am I being ridiculous for not wanting to be with him anymore or falling out of love with him because of his past and recent findings ?