This might sound a bit harsh, but i am hearing a lot about the practical things like money but you don't sound all that bothered. Of course it is probably that you are trying to stay calm, and if so I am sorry if I seem critical. BUT you don't share a bed and haven't done for some time - perhaps he just needs to find a sexual outlet somewhere, if he isn't getting one at home? And if he is a nice man, then it is perfectly possible that he might get fond of a lover, especially if that closeness and fondness is not a part of his marriage. Understand, i am not making a statement about the nature of your marriage, as i can only go by what you say, but i am not really hearing much emotion, and that leads me to question if perhaps that might give a clue as to his behaviour, particularly as you say he is still the same towards you. Good luck with things, whatever you decide to do, but my advice would be to be "better than that" and confront him rather than sneakily squirrelling money away (you are entitled to half by law anyway) and spitefully giving him garlic etc.
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. Do practical things to help yourself. See a lawyer. Go on holiday. Distance yourself emotionally. 