Breathe Oz (hugs) it might seem like its all gone pearshaped but actually perhaps this shake up is what he needed. You say he has reverted to some boy behaviour, my H certainly did, infact the one good thing was that having brought up a S I could see the similaraties! it also shows you just how much turmoil your H is going through and IMHO its not all "script" as some one said on here recently just because you perceive something not to have been hurtful it is hurtful to your spouse and therefore giving them pain.
Ok he has gone, I thought my world had ended the day H and I separated, but actually its been good for both of us, he needed time to think without any pressures from being with me, and from that I dont mean pursuing etc, I think just having me in situ was causing even more confusion, guilt and pain, and like you have to step away from a situ to "see the wood for the trees" I think he was the same! and maybe you GAL has done the same for your H.
Its good you have a DB councellor on board, Im certainly going to suggest we talk to one if we get any nearer reconciling, or if not on my own when I get a job. I know your sitch is different to mine, but Im all ears if you need to bend one!
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W 47 H 47 M 24 T 30
Once lost but now found and happily married again!