You notice disturbing divergence on certain core issues and values.
Contention and aggression during discussions are increasing.
The outside world has already begun to notice the discord.
You do not want to dramatise, hoping instead for the best.
There is already less genuine joint-solving of problems.
The problems inside the relationship have intensified.
You have offered several initiatives to restore good relations.
You now realise that the external knock-on effects could be costly.
There are many crucial matters which require full cooperation now.
Your own friends and allies are expressing split opinions about the alliance.