Cherokee Purple Tempermental

[Godlike]

Hi, My one Cherokee purple plant is now three months old and it has one tomato down low. The plants has had numerous flowers over this three month period, but all have just dried up and fell off. I have fertalized the plant with E B Stone Tomato and vegetable food, E B Stone lime, and E B Stone Green Sand. The plant still has flowers but no tomatoes. It has been a cool spring and summer so far.
Any advice is appreaciated.

I may pull it out and plant a hybrid instead.