I do that too. I continue to do it even things are ok with H. I don't know why I do but think it may be to do with all the hurt etc. Try talking about it with your H - you don't have to say why you are withdrawing; just that you can feel that you are and ask for a bit of space to work things out. I always feel better after discussing the fact that this is happening to me with my H.
Saffie me 46 H 46 M in 1986 D20,D18,S16,D13 H's A 01/05 to 07/06 H recommitted to M 07/06 renewed vows 09/06 Going from strength to strength