I'm going to end my relationship
Why are you gonna break up with your gf?
It's complicated, but the main reason is that she has bad taste in music.
It's fine to want to end a relationship if you don't have a lot in common. It's better then dragging it out.
Yeah,  I'll break up with her. I'll send her some nasty text and move on the right person.
I am sorry about the end of your relationship but it is normal that not all relationships work out. You should however be nicer when ending the relationship.