The end

So on Tuesday I officially ended individual therapy, I've been saying that I was okay and ready, but now feel a bit sad as I won't have my therapist to talk to anymore. I still have group therapy on Mondays, plus my case manager and psychiatrist. But I just feel a bit strange, even a little sad, it's supposed to be a happy occasion as I've gotten all that I could out of individual, and in the 20 months I've been in individual I worked on most of what I came in for. I was in an intensive DBT program, stage 1 skills group, and stage 2 focused more on trauma (stage 1 was a year long group and stage 2 I was only in for 4 months). Now I'm in a depression and anxiety group which I like, I like the therapist and group members, it's fun. But man will I miss my therapist. The thing is I wasn't really attached to her and had no transference to speak of, so why do I feel sad all of a sudden? I've had 2 case managers leave and a psychiatrist retire since I've been going to the agency I go to and those didn't affect me much. Sigh, here comes grief. Is this normal? I should be happy but yet I'm sad. My therapist said if I ever need indivwelcomegain I can always come back (but it may not be with her). I don't know how I should feel about this. Any and all opinions are welcome.