Promise

prom·ise /ˈpräməs/ - [n] A declaration or assurance that one will do a particular thing or that guarantees that a particular thing will happen.

"There's something depressing about knowing that your life is the way it is because of the decisions you made, no matter how long ago it was when you made it. It could be something sad, like you had told your mother that you wanted to be a ballerina and fifteen years later found yourself in the ballet studio for the millionth time wishing you could just break your leg so your mother would finally pull you out, or deciding that the milk was only off by a day and so it would be fine to drink then finding yourself in the hospital. But the worst kind of decision to make would be to walk away from someone you love dearly and then ending up in a broken relationship with someone you harbour no feelings for. It's even worse when you don't know who made the decision - you, or him? - and spend forever blaming yourself anyway."