I saw a T for many years and then left therapy abruptly (I announced mid-session that I wouldn't be coming back again). I reconnected with this T many years later and she describes the abrupt termination as being very painful for her. It wasn't a sense of abandonment as such for her (she was never 'dependent' on me) but a lack of closure, and a sense of great concern for me.

I would think most Ts would not feel abandoned by clients that go on vacation or abruptly terminate because a) most ts do not have abandonment or dependency issues b) most ts are NOT dependent on thier clients, but get their personal fulfilment from the significant others in their lives and c) professionally, most (hopefully!) ts are aware of their own counter-transference issues and can deal with them objectively.

Having siad that I do think Ts can develop very authentic and deep relationships with their clients and can certainly 'miss' them.