Do you have a fear of abandonment?

I got myself into a mess last year and over the course of a few days, I lost every friend I ever had. Most of these were online-only, with an extremely slim chance of ever meeting, so I find myself not really missing them at all. Ultimately I realised that as a result of what happened, they weren't as strong as I had thought.

Despite having made a new friend and a few other (healthier) connections, I do still have this fear of it all disappearing. I feel like the level of care and support I need is greater than what it was, even more so than when I was a child. I feel as though I need the people in my life to form a protective ring around me, so to speak. Articulating that is the hardest part though. 

I see a therapist who I'm really grateful for, and she's reassured me that she won't disappear (without warning anyway).