I (f17) and my bf (m17) are currently in a long distance relationship. I love him very much, and he's someone I can see myself being with for a very long time. 

I feel very anxious about my bf. All though I have no evidence that he would ever do this, the thought of him finding someone who is more local to him, and more attractive than I am, and dropping me as his main partner.  I feel like I'm not enough for him.

My last relationship ended horribly, and I was emotionally crippled for months afterwords. I don't want to go through this with my bf.

Does anyone know how to stop this type of anxiety?