obligation
Obligation is like being tied down by a chain you can’t break because you promised someone you would never let them down.
I said I’d help her move. Now I’m stuck carrying furniture up three flights of stairs. I promised I wouldn’t let her down.
He agreed to help me out because he felt obligated. Now I owe him $200 and he still says he’s going to take me to court.
She said she’d take me to the movies. I showed up. She brought her whole family.