Boyfriend keeps having crazy nightmares about me? what does it mean?

Okay so I need help with a reoccurring theme - my boyfriend keeps having nightmares of me cheating on him.

Backstory: Me and him are in a monogamous relationship for 1 year so far (also I'm a girl btw), he's been cheated on before and I'm a person who doesn't even flirt with other people.

Today he woke me up crying and told me he had a nightmare that me and him had a fight and I stopped talking to him, he tried everything he could to talk to me and even tried showing up at my school to talk but I wouldn't.

The next time he found me in the nightmare was I was at a club and random guys where flirting and touching all over me.

And that's been a reoccurring thing in his nightmare- me not respecting him or communicating and then going to flirt with other guys and being touched all over by them.

I understand this might come from insecurity- but believe me I would never do this to him in real life, I would like to hear what you guys think it means.