This is one of those things where even though the truth is important, the fact that people thought this is what was happening is a sign of a poor relationship. It's like if a person thinks their partner cheated when they went to Las Vegas. Even if the partner did not cheat, the person believing that it was not only possible but likely is a sign that the relationship is toxic. The implication is that the partner is not in the relationship voluntarily or for the mutual benefit of both. Rather, the relationship has become antagonized and transactional. The partners are not helping each other grow. They are in a relationship in which taking advantage of the other is expected because it has happened multiple times already.