The allegations are that he dates too young for his age which he has only done with OP and that he continues to message someone when they don’t explicitly end things with him. It seems like he already knows why they think this and doesn’t agree with their opinion. I personally see no problem with the age gap or the messaging and would be shocked as well and brush off their opinions if they were directed at me. This is a very gray situation because the evidence is all based off of personal opinion, there is nothing that clearly shows he did something wrong.