Why do you feel like it wouldn't feel the same anymore? I think it's good that it wasn't him just wanting a holiday, planning it for ages and still only telling you last minute. It sounds like it's pretty understandable and you seemed to think that yourself. So there's no reason you would need to feel differently towards him or your relationship or work together. You could resent his boss though.. and when you return you can tell him how much you've struggled and that you don't feel it was very good or therapeutic in any way and that you wouldn't have coped better if you could have had contact and would much prefer that in the future. I can't see why he would drops sessions or in between contacts if you've "managed". Could you make like a timetable for yourself.. like Monday.. visit library. Tuesday swimming. Or whatever you like doing. Might be a totally stupid idea. Things like that help me a little bit but might not be useful for you.