Hiya maggie, still not sorted it out then I see,
I think you may have to start looking into the fact that there might be another woman(or man,bluuuuergh) on the scene, is he always having to nip out at short notice, does he always have his mobile phone on him, ie, never leaves it laying around the house.
When he goes out for a beer, does he come home reasonably sober?
I hope this is not the case, good luck
btw...I`m no expert at this, I just read it somewhere ;o)