SP refusing to see me again because she doesn't want to disappoint.

[EagerBeaver]

Doesn't really matter why, but could be because she's worried you're getting too attached and nobody needs that headache.

Most likely reason

 

[skarsga]

I see little point trying to figure out if there is a hidden reason or not. Mind reading is fraught with danger. Getting too attached also a risky business.
Good Opportunity to find a new regular.