I'm sorry it's come to this love, BUT you need to think of yourself FIRST and foremost at the moment, so get yourself a solicitor. I'm not sure how the law stands as yet, but you may have to go through some kind of mediation - that should help you sort out the finances.
If you're going to be in finanacial straits, then as somebody else mentioned either letting a room or letting the property itself could help you finanacially.
A lady at the WI where I used to go went through all this, and somebody who had also been through a divorce advised her, which she did, refer to the 'problem' in front of her husband as 'Your mid-life crisis'. The husband got angry at this at first and she counter-attacted by saying, well, what else do you think it is? - You said you were not sure of your feelings anymore - why not - what suddenly changed between us - because somebody else came on the scene and started throwing themselves at you (sexy trexts) - which you did nothing to stop, even though they were inappropirate to a married man - despite what you say, you were flattered. Look what you've thrown away, nearly half a lifetimes worth of happiness on what - a woman who likes to chase married men - you do realise that once she's got you, you'll have created a vacancy and she'll drop you like a hot potato once somebody richer/younger and better looking comes along...
I know it's easy for other people to say these things to you, and I hope you've got the courage to go through with what you must - be strong, think of yourself FIRST he's hurt you enough, it's time for you to take charge and do what's necessary and stop hanging around waiting for him to decide. You can tell him the door is always open if he wants to discuss things - but all this faffing about is getting you nowhere and you'll drift unhappily for months, or until 'madam' decides she's sick of him, and why should you have him back because she doesn't want him anymore? Make things YOUR