Things my seem fine with yummy and your best friends but u may never know

Me and my best friend has aways had problems but we aways fix them like most people we fight there and then but this one is different we been close friends or even best friends for about 3 years and I had never had problems like this before. one day recently I was trying to get a hold of her and after a while we where fighting and she told me I was the reason for her suicidal thoughts and we have not talked since I did not know this and idk what to do I tried repairing are relationship but she is not responding back idk what to do and I love her and don’t know if I should let her go