Relationships That Ruin Friendships

My ex best guy friend and I have known each other for four years and during that time we got together. We were each other’s first loves and we thought it was the perfect combination, being best friends and dating at the same time. We were totally comfortable around each other. We argued a lot but always apologized and ended up with a makeup kiss by the end. One fight overstepped the boundaries and now we hate each other. I deleted him off Facebook and he blocked me. It’s been a month and a half. I wish this whole dating thing never happened. I miss him so much.