Name changed for obvious reasons as this will turn into a bun fight and I value MN for lots of reasons. But I was the OW and am now engaged. So to answer your questions.
Do you ever feel any remorse?
Yes. Frequently.
Not about our relationship because we're generally very happy.
(I'm not going to do that oh we're meant to be and it's the biggest love story of our time thing that so many OWs do, it's a relationship, it has ups and downs, but I love him dearly and cherish our relationship).
But I do feel great remorse about how our relationship started. I hate the idea that I could cause someone else pain, and regardless of the state of their marriage (not good) I deeply regret that our relationship started so dishonestly.
And to answer your question up thread about remorse coming afterwards, I felt deep guilt at the time. I kicked him to the curb and said he had to do the right thing, and walked out of his life. He left and now we are together but it doesn't change how it started.
In the moment it is difficult because you very much disassociate yourself from that other family life and focus on your budding relationship, but I felt guilt all the time which is why I ended it (constantly week in week out when we were cheating and then permanently until he left).
Do you feel like you 'won' the man?
No. It was never a competition. It was desperately sad and stressful. I love the man, and I can't deny that I am happy we're together, but I take no joy from the circumstances.
do you ever think about what you did breaking up a relationship?
Yes. Often.
do you trust your partner knowing that the relationship started on lies?
Honestly, yes I do. Insofar as I understand the issues that led to the breakdown of his marriage (which in his mind was over loooong before he met me) and we don't have the same problems.
Communication was the biggest issue, that and resentment. That said, clearly he is capable of cheating when he is unhappy and has detached.
So there is a question over whether he would cheat on me if he was unhappy and of course, it's possible.
But I think he's learnt from it - he was deeply miserable and guilty, so I hope he would leave rather than cheat.
And we have therapy to work on all these issues, build trust, and keep our communication strong. So I hope and trust that he won't.
In all honesty, I believe anyone is capable of cheating given the right set of circumstances (which doesn't at all mean I condone it. I wish more than anything that OH had been brave enough to leave rather than cheating to escape) so I'm no more or less worried than I would be in another relationship.
Do you ever tell people the truth about how your relationship started?
Some people know but I don't yell it from the rooftops. Neither of us think it's something to be proud of.