You can have a good reason and still be avoiding a necessary conversation.

The best excuses are true. The timing genuinely is bad, they genuinely are under strain, this week genuinely is the wrong week, and every one of those facts can be accurate while the real reason you have not spoken is that you do not want to. Truth and avoidance sit together comfortably.

Ask what conditions would have to be met for you to have the conversation. If you cannot name them, the reason is probably not the timing. Pick a date, tell someone else you have picked it, and keep the reason as a reason rather than letting it become the decision.