First of all, I want to say that I am a person who likes rock and heavy metal very much. I usually listen to rock music, but I am introverted and shy. I usually have a good personality and don't like losing my temper at all. I also have many such friends around me. Most of them are very kind people with good personality, and no one has a tendency to violence. This shows that people who like rock music have nothing to do with behavioral violence. These people just like rock music, and they can't judge a person's character directly because of superficial phenomena.
Secondly, what I want to say is that people who like rock music are people with attitude and strong sense of justice. They advocate equality, freedom and peace. Rock and roll is a perceptual criticism and a perceptual philosophy. The reason why we see rock or heavy metal so crazy is because they dare to shout and criticize. This is a kind of spirit, an attitude, and not everyone dares to do so. Put aside these crazy moves and return to reality. People who like rock and roll are so kind They pity almost all the sufferings between people and give them inner cries. Finally, people who play rock and roll are people who are obsessed with their own ideals. Behind them, there are hardships that others can't imagine, not for fame and fortune, but for being themselves.
If your boyfriend likes rock music, congratulations, at least he is a fair and kind person and has no so-called violent tendency at all. Trust them, and they will definitely give you a bright future.