Yes, some therapists get attached to their clients. If it becomes an issue or becomes too intense for the therapist to manage, it is sometimes called "counter transference". If a therapist gets too attached to a client, they've got some of their own issues to work out likely so it's normally suggested that T's have T's.

Some attachment is normal, but a T doesn't necessarily have to like you to be able to work with you. It just makes it easier if they do like their client(s).