<human>: Can you condense the text into a few key points?

Ok so I think I have opportunities here but I have no idea what to do. To keep it short due to unfortunate circumstances, random acts of cock-blocking or basically being forgotten I have somehow ended up in a situation where all of my close friends have drifted away from me to the point I never hear from any of them any more and my messages barely get replies.   

Detrimental relationship breakups for them have left my two long term close friends different people. I still talk to one who is a great guy but seems to always be busy if I'm asking but has time for others :/ different story for a different day perhaps.

That leaves me with one remaining close friend, I count myself extremely lucky to have someone as honest and kind in my life that I can openly discuss my problems with.  We work together (that's how we met) and get on fantastically. She knows that I'm annoyed that my other friends from outside work have been crappy to me but I haven't told her that it's so bad I don't talk to any one outside work. 

If I tell her this I have to say that she's now my only remaining proper friend. I'm afraid that's something she might not be expecting and I don't want to make her feel uncomfortable with that fact. I don't want to loose the best friend that I have but she is the only one I would trust to tell this to. I don't know that if she really is as kind as I think she is it wouldn't make he think any less of me.

To clear up any potential misunderstanding it's a platonic friendship. Not throwing that complication spanner into my issues! There are people I'm friends with at work would never meet them outside it or at an event associated with work.
<bot>: One friend left I trust and can communicate with honestly, I don't if I should tell her that this fact is eating away at me without freaking her out that she's my best friend/only remaing close friend