There are a number of reasons this could have happened, and some of them don't have anything to do with your therapist's preferences. If you are working with an agency or some kind of group system, it's possible that some kind of administrative issue is the reason why you would be sent to someone else.

If it was because of your therapist's issues, then it's still not your fault. One of the great big rules that therapists must follow is that if they cannot keep themselves in an appropriate emotional space with a client, then they need to refer the client elsewhere. It is unethical and inappropriate for a therapist to try to do therapy with someone when it they (the therapists) are unbalanced by the client.

That does NOT make you bad or too sick to help or anything like that. It just means that your therapist has limits, in stuff like emotional availability and in professional skills, that make it no longer a good fit from the therapist's side.