Let's be clear, the difference between sugar dating and escorting is in this example.  We aren't on a timer, a client to schedule in, etc.  of she's just gonna fuck a guy real quick for cash that's escorting.  If that's how she wants to live that's her call.  

But be clear on what you want.  If you are ok with this, who cares?  If not, then make a change.

I have certainly had SB's in the past who were seeing other SD's or BF's (in one case Hubby).   As far as I know, none of them were scheduling back-to-back (no pun intended) fuck sessions.  None of them where juggling schedules like they worked at Cirque du Soleil, either.  

 
The only exception was with my Latina SB about 3 years ago when her BF completely failed to get her off through oral and she was so frustrated she drove directly to my place for 2+ hours of mind-bending DATY. Didn't even want allowance - just wanted to get her cookies. (Of course, I still handed her the allowance as my load was leaking onto her thigh because I am a gentleman.  

 
The question still to be answered: Do you care more about her "job" or the (for lack of a better term) poor customer service?  

 
Life is good

 
The Cat

Thankfully this is an outlier. A bad bit of vetting on Sympathy's part but then again how would one know? That you happened to know the other guy in the equation seems too coincidental to be true. This is the kind of behavior we like to get away from when we engage in true sugar relationships. Good to always be on guard for such unfortunate situations like this, however difficult it might be to detect. Better luck in vetting of character moving forward, Sympathy! Caveat emptor!