Losing Twice As Much

I have been friends with my ex for 5 years. She recently confessed her feelings for me I from the beginning told her I wasn't mentally in the right place to be in a relationship and I had a few things I wanted to have handled before I pursued a relationship. She said she understood but once she admitted she was in love with me she started to show she was and it was almost like she did everything to make me fall in love with her. I still wasn't in the place I wanted to be so I still couldn't commit and it hurt her. I also dealt with a very difficult family issue and I shut down emotionally which also hurt her. She ended up leaving me. Said she wants all of me when I'm ready. But she already is dealing with somebody new and says she likes them but won't be with them because she's in love with me. But she already is sexual with them. I haven't been with anybody since we started having sex. I feel like I should leave her alone to be happy with her new person. She still tells me she loves me. Leaves love songs on my voicemail. Tells me and others she wants to marry me. I don't understand how she could move on so fast and still want me and these things. I blocked her calls and texts. Deactivated my social media I cant see her with someone else. I feel like I lost my friend and my love. I don't know what to do. Please help.