I think this is a serious risk of therapy that is rarely framed as a risk. Forming a bond with someone who will then disappear from your life, sometimes abruptly, could be quite distressing. The standard framing is that it is an inevitable part of some "process". The standard advice is to see a new therapist or counselor to cope with this loss, and thus risk forming yet another attachment that might be severed. Some might say, eh, that's life, what do you want, but I think many would agree this is different. Only thing that helped me was to put it in proper context.