Dear skaredy, I can say this, from my experience......It is harrrd to keep boundrys intact when one person has romantic attraction more than another. I have seen numerous "Lets just be friends" situations turn sour.
I would say to consider the following:
1. What is your state of vulnerability, right now?
2. How far along are you in your own recovery program? How much can you trust yourself--if things turn south? to avoid past patterns?
3. Just because you knew him for years at work doesn't mean this is the same person you would meet in an in timate situation. Living with someone always reveals a person that you had not previously "known"
Lots to consider...I know....but, the stakes are high...very high.......sigh!
dandylion
P.S.--there is also the matter that Suki mentioned. Don't let yourself be in a situation that could hurt you down the road. Ex husbands can be vicious o n that front!