Communication is key (from my limited understanding of relationships) Saying how you feel and listening to how others feel is important.

Take the horse barn issue, you perceive she does not understand your reasoning for not wanting to go to the new barn but have you told her why?

I know it hurts when people stop inviting you to places, I've had that happen to me. Even recently knowing that they are driving right by my house to another friends house to have fun I am not invited to hurts. I have come to accept the hurt and feeling of rejection. Life is half hurt, and people change. I try to focus on creating new things and changing myself.

I deleted facebook too. Being that artificially connected 24/7 I found unhealthy. My relationships improved when I focused on face to face interactions and spending quality time alone.

I'm sorry your going through this