I lost my best friend

So my best friend of 4 years asked me for $1,000 for her birthday present and I said yes. Then I said no. Then I said yes again and sent her $100. Then I talked to my therapist and my therapist said not to send her the money so I told my best friend that and she sent me back the $100 I sent her and then she blocked me. I’m sad that I lost our friendship and I’m still trying to get over her and move on. I liked her as more than a friend so it’s really hard.