Whether kissing someone else while in a relationship is considered cheating depends on the boundaries and expectations established by the individuals involved in the relationship. Different people have different definitions of what constitutes cheating. Some may view any form of physical or emotional intimacy with someone else as cheating, while others may be more lenient depending on the circumstances.
In the situation you described, it's important to understand that the dynamics of online or long-distance relationships can be unique. People in such relationships often face challenges related to physical distance and limited in-person interactions. Nevertheless, these relationships can be just as meaningful and committed as traditional in-person ones.
However, regardless of the type of relationship, trust and communication are crucial. If your partner is bringing up the incident a year later, it suggests that it may still be a source of hurt and concern for her. It's essential to listen to her feelings and have an open and honest conversation about it.
If you both decide to move forward in the relationship, it might be helpful to establish clear boundaries and expectations to avoid similar issues in the future. Building trust and addressing past concerns can strengthen the foundation of your relationship. Seeking the guidance of a couples therapist could also be beneficial in working through these challenges together.
Remember, every relationship is unique, and open communication is key to navigating any issues that arise.