Hmm. Well as previous posters have said it is possible for men to marry the OW and things all end up well (with shorter term repercussions). I know at least 2 couples who fulfill this criteria including one where they both had affairs and are still together 28 years later. So it is possible you are not being taken for a ride.
HOWEVER
Of the couples I know in the above scenario, when they recount their story, what shines through is the certainty, the absolute faith and trust they had in each other, so that they knew they would be together. There were no silly games, no gas lighting, most importantly - none of the dragging on for years and moving the date to leave continually further down the road. In effect their love for each other compelled them to act.
I have another friend who after 7 years of being OW and 'waiting' has been dumped after giving birth to his son. She has wasted 7 years of her life during which her mental, and emotional health suffered from the constant cycle of having hopes raised and dashed. Him dumping her so cruelly (because the pregnancy forced him to make a choice - so he chose to stay with the woman he 'couldn't stand and could no longer bear to sleep with'
) left her a nervous crying wreck on the floor, and now she's on anti-depressants
. Since then she has found out he had a 2 year old child during their affair. A second child with the wife 'he was no longer sharing a bed with'.
I think you need to step away and think about the probabilities here which are not in your favour. Regardless of things turn out in the end you are, right now waiting on him and questioning your thinking and position already. The crazy cycle has been initiated.
You are also contributing to the demise of a marriage and causing considerable hurt to a stranger and his children who are innocent. It does not matter that you do not know them personally. It does not matter that his marriage is about to collapse. What is certain is that with you in the way, any way back for them as a couple, or mitigation, or intervention is pretty much being scuppered. And the prospect of an amicable divorce - which would spare the children some pain - is also less likely.
Do you want to be responsible in any way for that? Men only do this because we let them.
I know you love him, but love doesn't justify every action. Love and respect for yourself is as, if not more important. Only you can decide if continuing with this relationship will facilitate or impede the latter. My advice is step back with a view to detaching and moving on to something better.