He might become very withdrawn. He could stop going out with friends and just stay at home, feeling sorry for himself.
He could also be very angry. If he feels blindsided by the break - up, he might lash out at Catherine. He could accuse her of leading him on or not being honest about her feelings all along, and this anger could be his way of dealing with the pain of the break - up.
Perhaps Catherine constantly belittles Steve in public or in front of his friends. Over time, this emotional abuse causes Steve to feel unloved and unwanted, and his heart is broken. She might make him feel like he's not good enough for her, which ultimately leads to the breakdown of their relationship.
In the context of this fanfic, Catherine Rollins and Steve are likely characters created by the fanfic author. They could be original characters, or they might be based on existing characters from a particular show, movie, or book. Without more context, it's hard to say exactly who they are other than two individuals whose relationship is central to the story where Catherine makes Steve cry.
One common theme is love and relationship building. Their relationship is often explored, from the initial attraction to deeper emotional bonds.
In this fanfic, Catherine realizes that she and Steve have grown apart. She sits him down one evening and says, 'Steve, we need to talk.' With a heavy heart, she tells him that their lives are going in different directions. Steve is shocked at first but then realizes she's right. Catherine leaves, and Steve is left alone, looking at the empty space she once occupied, feeling a mix of sadness and acceptance.
One reason could be that their careers are taking them in different directions. Catherine might be getting opportunities in a different location that require her to be away from Steve for long periods, and they both realize that a long - distance relationship won't work for them.
One possible plot could be that Catherine Rollins reveals a long - held secret that Steve has been trying to keep buried. For example, she might expose a mistake he made in the past that cost his team dearly. This revelation shatters Steve's composure and makes him break down in tears as he realizes the consequences of his actions coming to light.
One popular Catherine Rollins Steve fanfic might be 'A New Beginning'. It explores their relationship in a new setting, with lots of character development. It shows how they face challenges together and grow closer as a result.
On the other hand, Steve might be more understanding than expected. He knows about Bucky's past traumas and could suspect that something else is at play. So, instead of immediately resisting, he might play along for a while, waiting for the right moment to figure out what's really going on and how to help Bucky.
Reconciliation can also be a theme. Given the on - again, off - again nature of their relationship in the source material, fanfics may focus on how they overcome differences and come back together, highlighting the strength of their connection.