sorry to hear your issues wizzywizz,most marriages have to be worked at, none of us is perfect.

Its simple as others on here have already said, if you love her then obviously you accept the good with the bad. if you have fallen out of love with her, the i ask you why are you still with her ?, obviously you have only told us of certain of your circumstances without knowing the bigger picture its difficult to give you definative advice, No children involved so thats a blessing, but age, property all come into the decision making process, if there is no Love and it sounds doubteful from her side, then get out and start again the ocean is a big place good luck whatever you do..