he doesn't love me anymore.

well today my SO and i were talking about issues we need to fix in order to be happy.. he looked at me and started crying. he straight up said " i dont love you anymore. i feel like im being forced to stay in this relationship because we have kids, i feel like we shouldn't be together" that shit broke me. 6 years in a relationship we are having another baby in 2 days. why couldn't he have told me this way sooner.. i feel so Sad that i feel like vomiting and im having diarrhea now and im shaking.. how do married couples go through this. how do they make it last. I need some advice please.. i dont want to separate either because of my kids.. im really sad..