You're in a group, a friendship, a romance, and certain things just aren't working.  It might be money, it might be scheduled events, it might be communication.

You've tried everything you know to try, and everyone involved is doing their best.  What's happening?

Someone in the situation is incompetent - for example, someone simply can't handle money - and their incompetence dooms any attempts.

There's no fixing this with them or for them.  They will not improve and they will not learn.  Exit this interaction - you can do other things with them, but not what they are incompetent at.