How you can sabotage your own happiness waiting for others to change

Waiting for someone to change is often a waste of time. They can promise and tell you they're working on it, but are they? Has anything changed in the past day, month, or year? Or do things seem eerily familiar day after day? Sometimes we sabotage our own path to happiness waiting for someone to follow through on a commitment they said they'd do. When they don't however, what's your next step?