This is the defining challenge for married cofounders I coach. While that's not a reason to avoid building a company with your spouse, it indicates that the complexities of this relationship deserve extra time and attention. You can't decompress from your cofounder on the drive home, because your cofounder is home. Fusion, and What Stops Getting FedIdentity fusion is the point where spouse, cofounder, and individual stop feeling like separate things. Your marriage is resilient, and you've built an ability to tolerate these cycles of rupture and repair in ways that most cofounder relationships haven't.