I don’t get it ok, not being nasty or difficult.

I let things get to me on a personal level because rejection is a trigger for me. I don’t get how one minute someone can be so chatty and friendly via email and then go so cold on me. I start wondering what is so wrong with me?, and then that pushes me into depression etc. It did my weight loss some good but mentally it wasn’t good for me. I know it’s not always personal but that doesn’t make it hurt less. I genuinely liked the other person. I wasn’t being fake whatsoever. I never am. That means someone didn’t like who I am. I’m trying not to let it get to me but it still is a little because it changed so quickly.