Partnership fatigue is rarely about the partners. It is about the design. Agreements written in the first flush of enthusiasm tend to under-specify the boring middle, where most partnerships actually live or die.
Lasting partnerships start with a shared definition of success that is specific enough to be measured and modest enough to be achievable. Vague ambitions create vague disappointment.
They also name the unglamorous mechanics: who owns the relationship on each side, how often you meet, what triggers a re-negotiation, and how either party gracefully exits. Naming the exit is not pessimism; it is the clearest signal of mutual respect.
Governance matters more than chemistry. Founding partners move on. Strategies shift. A partnership that depends on two specific people will not survive the second year. One that is held in process — joint planning, shared reporting, a steering group with real authority — has a fighting chance.
Finally, lasting partnerships are reviewed honestly. Once a year, both sides answer the same three questions: what is working, what is not, what should change? The conversation is rarely comfortable. It is almost always useful.