Cheated on

Me and my bf have 2 kids two months before I had my second child I found out he cheated on me and got the girl pregnant. We talked things out and decided to work things out and stay together. The girl just had her baby and I found out I’m pregnant again with our third child. I don’t want to stress myself out about the girls baby so I’m just forgetting about it for the sake of my unborn and other children. All three kids will be born 7 months apart.