When someone says “I can’t decide”, or “I’m not sure”, they are telling you something about themselves.
Although such comments might seem like statements of uncertainty and even weakness, they may well be the opposite.
For example, if you know you can’t decide you have already made a decision (not to decide). The same goes for not being sure. you must be sure about one thing at least – not being sure.
Indecision might seem like a weakness, but some people choose to stake everything on their ‘inability’ to decide. It takes a degree of strength to do that.