Working on myself

My bf has serious abandonment issues and I’m super insecure and I don’t love myself. I’m trying to live on my own so I can work on myself but i don’t know how to do it without my boyfriend thinking it’s personal and taking it as me abandoning him. How do I get over the anxiety of being alone and get him to understand it’s to help our relationship In the long run bc like everyone has told me how can you love someone else when you don’t even love yourself. You can’t. I need to be alone.