Agreement and insecurity
It is difficult to decide as you are insecure about the future outcome of your decision.
For this you try to reduce your insecurity in order to make the best possible decision/the best decision.
Reaching agreement requires the same from the other party./ When reaching agreement it is the same situation for the other party.
So if you would like to have a positive/favourable decision for yourself, reduce your partner’s insecurity about the decision.