The potential reasons that somebody would falsely accuse another of a college sexual misconduct allegation are countless. It could be because a relationship soured and the complainant feel scorned or is jealous because the respondent is, say, now in a new relationship. It could be because there were misgivings about what took place during the course of the relationship and this is a way of the complainant seeking, say, vengeance, or retribution for what took place.
The reasons would be on compensating the emotions and dynamics that we as people have in relationships when relationships do not end well. It can unfortunately motivate people to do things that they shouldn't do, namely to falsely accuse another. Whatever the reason may be, it's definitely part of the process or the case. You have to consider what the person's motive may be so that it can be properly responded to and that it could be addressed accordingly when defending oneself when accused of sexual misconduct allegations at college. An experienced attorney advisor who's been down this path many times before, that's going to be your best ally, and should be in your corner from as early as possible in the process to help protect your interests and to try to ensure a fair process and a favorable outcome.