Ending Long Term Relationship

My boyfriend and I have been together for 5 years. In the last couple months we’ve just really been disliking each other. When we argue the arguments are absolutely horrible with me calling him every name in the book and him doing the same. Some days we will try to have a good day together and go on a date but the smallest thing such as the song on the radio will cause a huge argument. We have decided that it’s probably best to end our relationship before we begin to hate each other. I’m so scared that we’re making the wrong decision. He’s been my best friend for six years and he has grown so close with my family. I’m just so unsure. Can any of you give me advice on what to do? Or just simply words of encouragement.