Partner

I just want to share a story. This is a story of me and partner. We've been together for 3 years. I love him sooooo much. He is the only man I see. We tried conceiving for 2 years already and with success I am pregnant. But the thing is. I am extremely pained from my situation. I am a mistress and I never knew. It pains me so much that I was really happy then everything will be gone in a single snap. He wants me to stay and said that he will fix everything. The thing is, his wife gave birth last week. I feel like dying. I can't sleep at night and I know my baby is affected. I just want to let this out because I am hurting so much. ? I still love him. He still loves me according to him. But I know it's wrong to pursue this relationship. ??