@ashamed,
What is happening here is that he was opportunistic with you and inadvertently he did end up loving you. This is always a possibility as he is attracted to you for the combination of values he sees in you. Something he was missing at home. Even without medical issues regarding his wife I would say the same relationship deficits would be possible in your boss's circumstance.
The steps made to leave her where appetizing for him given his family situation also. The sudden lack of thrust to leave his wife for you is a realization he is valuing the security and stability of his current love deficit ridden home life. Such sustained pullback is an indication and reality check that he is now not going to risk his current situation. Therefore I'd say he is not in love with you.
Admiration is sometimes referenced as love, but if people don't leave their current dissatisfaction then the real meaning of love is not evident. I've published and defined Love is a combination of values realized which are not replaceable. His current relationship isn't replaceable on my best comprehension of your question. For you it was a catalyst to realize you had to move on. I wouldn't look back on your prior relationship either. Your realization of absent love was made with action.
The prospects of a relationship with your boss are formed already. A negative outlook. So what is formed in my response to you is don't go back to your husband and don't continue with the boss. Unless of course , like the boss you value security and companionship even though love is lost.