As a way to understand the chain of effect from an event to the feelings it evokes, you can consider the level of responsibility you had. If you notice that the level of responsibility you had in the event doesn't line up with the feelings you're having, you may be placing a greater level of responsibility on yourself than there actually is.
The ABC model is a way to break the processing of feelings down into discrete steps. It involves identifying an activating event, the belief that stems from that event, and the feelings that stem from that belief.